Question

嗨，我正在写一些关于网络接口管理的事情，只是为了花时间。我在c中编写了一个函数，使我能够放下或者放置一个接口，或者谈论wlan接口，改变模式，如监视器管理等。现在我想改变wlan接口的监听通道，所以我冲浪了网和我找到了不同的解决方案，如使用nl80211等。在我看来，最有趣的是ioctl。所以我写了这些代码

int changeChannel(int handler,int channel){
  getChannel(handler);
  wreq.u.freq.m=  RETRIEVE_FREQ(channel);
  wreq.u.freq.e = 6;


  short app = ioctl(sock,SIOCSIWFREQ,&wreq);
  if(app<0){
    fprintf(stderr,"Error to change the on %i channel to %s\n",channel,interfaces[handler]);
    return app;
  }
}

int getChannel(int handler){
  iw_get(handler);
  register short app =ioctl(sock,SIOCGIWFREQ,&wreq);
  if(app<0){
    fprintf(stderr,"Error to get the channel from %s\n",interfaces[handler]);
    return app;
  }

  return RETRIEVE_CHANNEL(wreq.u.freq.m);
}

其中RETRIEVE_CHANNEL和RETRIEVE_FREQ是用于从频率获取频道和从频道获取频率的宏。定义如下

#define RETRIEVE_CHANNEL(freq) ({\
int _channel = -1;\
switch(freq){\
    case CHANNEL1:\
        _channel = 1;\
        break;\
    case CHANNEL2:\
        _channel = 2;\
        break;\
    case CHANNEL3:\
        _channel = 3;\
        break;\
    case CHANNEL4:\
        _channel = 4;\
        break;\
    case CHANNEL5:\
        _channel = 5;\
        break;\
    case CHANNEL6:\
        _channel = 6;\
        break;\
    case CHANNEL7:\
        _channel = 7;\
        break;\
    case CHANNEL8:\
        _channel = 8;\
        break;\
    case CHANNEL9 :\
        _channel = 9;\
        break;\
    case CHANNEL10:\
        _channel = 10;\
        break;\
    case CHANNEL11:\
        _channel = 11;\
        break;\
    case CHANNEL12:\
        _channel = 12;\
        break;\
    case CHANNEL13:\
        _channel = 13;\
        break;\
    case CHANNEL14:\
        _channel = 14;\
        break;\
}\
_channel;\
});
#define RETRIEVE_FREQ(channel) ({\
    int _freq = -1;\
    switch(channel){ \
        case 1:\
            _freq = CHANNEL1;\
            break;\
        case 2:\
            _freq = CHANNEL2;\
            break;\
        case 3:\
            _freq = CHANNEL3;\
            break;\
        case 4:\
            _freq = CHANNEL4;\
            break;\
        case 5:\
            _freq = CHANNEL5;\
            break;\
        case 6:\
            _freq = CHANNEL6;\
            break;\
        case 7:\
            _freq = CHANNEL7;\
            break;\
        case 8:\
            _freq = CHANNEL8;\
            break;\
        case 9:\
            _freq = CHANNEL9;\
            break;\
        case 10:\
            _freq = CHANNEL10;\
            break;\
        case 11:\
            _freq = CHANNEL11;\
            break;\
        case 12:\
            _freq = CHANNEL12;\
            break;\
        case 13:\
            _freq = CHANNEL13;\
            break;\
        case 14:\
            _freq = CHANNEL14;\
            break;\
    }\
    _freq;\
});

CHANNELNUM是我在枚举中定义的常量值，其中频道值与频道相关

现在我的代码可以运行，或者几乎就是getChannel。使用changeChannel ioctl返回0但是如果我启动

iw interface info

命令显示我始终是同一个频道。我的错误在哪里？对不起英语，感谢所有人的耐心

使用SIOGCSIWFREQ调用ioctl返回0但不更改频率

0 个答案: