[openwrt] 如何sync同步wifi的channel值

﹏ヽ暗。殇╰゛Y 2022-05-10 10:50 304阅读 0赞

## 说明： ##

路由器设备（MIFI）在通过STA模式（类似于wifi桥接，信号放大器），MIFI里面有一个5G，一个2.4G。2.4G下连，5G用于上连到别的wifi。

## 原因： ##

无线路由器channel与相近其他无线信号频段相同（或十分接近接近）会互相干扰,导致wifi使用异常。  
保证channel不相同。

## 做法： ##

起一个线程，每隔一段时间，去check一下，去检测channel是否接近。

void start_sync_channel_thread(void) // 创建线程
        
        task_sync_wifi_channel_thread(void) //真正sync channel的
        
        stop_sync_channel_thread(void) //销毁进程

## 设置channel ##

#ifdef SYNC_WIFI_CHANNEL
    #define IP_SIZE 64
    int get_interface_ip(const char *eth_inf, char *ip)
    { 
    	int sd;
    	struct sockaddr_in sin; 
    	struct ifreq ifr; 
    	 sd = socket(AF_INET, SOCK_DGRAM, 0);
    	 if (-1 == sd)
     	{ 
     		printf("socket error: %s\n", strerror(errno)); 
    		return -1;
     	}
    	strncpy(ifr.ifr_name, eth_inf, IFNAMSIZ);
    	ifr.ifr_name[IFNAMSIZ - 1] = 0;
    	 if (ioctl(sd, SIOCGIFADDR, &ifr) < 0)
     	{ 
     		 printf("ioctl error: %s\n", strerror(errno)); 
    		 close(sd);
    		 return -1;
     	}
    
    	memcpy(&sin, &ifr.ifr_addr, sizeof(sin)); 
    	snprintf(ip, IP_SIZE, "%s", inet_ntoa(sin.sin_addr));
    	close(sd);
    	return 0; 
    	
    }
    
    
    
    pthread_t sync_channel_thread;
    pthread_attr_t sync_channel_attr;
    
    void*  task_sync_wifi_channel_thread()
    { 
    	char cmd[128] = { 0};
    	char sta_ssid[128] = { 0};
    	char out_buf[512] = { 0};
    	char tempstr[256]={ 0};
    	char lan_wifi_channel[32]={ 0};
    	char wan_wifi_channel[32]={ 0};
    	char current_mode[BUF_SIZE_128] = { 0};
    	char *p=NULL;
    	int i=0;
    	int lan_channel=0;
    	int wan_channel=0;
    	int range_channel=0;
    	PCONFAPP pApp = GetConfAppPointer();	
    	char ip[IP_SIZE] = { 0};
    
    	while(1)
    	{ 
    		sleep(60*10);//10 minutes
    		memset( &cmd, 0x0, sizeof(cmd));
    		memset( &sta_ssid, 0x0, sizeof(sta_ssid));
    		memset( &out_buf, 0x0, sizeof(out_buf));
    		memset( &current_mode, 0x0, sizeof(current_mode));
    		memset( &ip,0,sizeof(ip));
    		lan_channel=0;
    		wan_channel=0;
    
    	// my_printf(LOG_MODE_LEVEL_3, " %s(%d) sleep i:%d \n",__FUNCTION__,__LINE__,i++); 
    
    		GetNVRamData("/etc/config/CusCMCfg.Mode.APMode",current_mode,BUF_SIZE_128);	
    		if(openUtil_strcasecmp(current_mode,"sta") == 0)
    		{ 
    			get_interface_ip("wlan0",ip);// get wlan0 ip
    		}
    		
    		if( (openUtil_strcasecmp(current_mode,"sta") == 0) && (ip[0] != '\0')) //wifi, should judge ip address
    		{ 
    			//get STA WIFI channel(wan side)
    			GetNVRamData("/etc/config/CusCMCfg.local_param.ssid",sta_ssid,BUF_SIZE_128);// if sta ssid 
    			snprintf(cmd, sizeof(cmd), "iwlist wlan0 scan | grep -w -A 5 \"%s\" | grep \"Frequency\" ", sta_ssid);//iwlist wlan0 scan | grep -w -A 5 "HUAWEI-BEVAQ8"
    			get_system_output(cmd, out_buf, sizeof(out_buf));
    			my_printf(LOG_MODE_LEVEL_5, " %s(%d)cmd:%s out_buf:%s\n",__FUNCTION__,__LINE__, cmd, out_buf);
    			if( (p=openUtil_strstr(out_buf, "Frequency:")) != NULL)
    			{ 
    				sscanf(p,"%*[^l]l %[^)]\n",wan_wifi_channel);
    				my_printf(LOG_MODE_LEVEL_3, " %s(%d) STA channel:%s \n",__FUNCTION__,__LINE__,wan_wifi_channel); 
    			}
    			
    
    			//get LAN WIFI channel(lan side)
    			memset( &out_buf, 0x0, sizeof(out_buf));
    			get_system_output("iwconfig ra0|grep \"Channel\"", out_buf, sizeof(out_buf));
    			my_printf(LOG_MODE_LEVEL_5, "%s(%d) out_buf:%s\n",__FUNCTION__,__LINE__, out_buf); 
    			if( (p=openUtil_strstr(out_buf, "Mode:")) != NULL) 
    			{ 
    			   sscanf(p,"%*[^=]=%[^A]\n",lan_wifi_channel);
    			   my_printf(LOG_MODE_LEVEL_3, "%s(%d)LAN WIFI channel:%s \n",__FUNCTION__,__LINE__,lan_wifi_channel);	
    			}
    
    
    			//If range <=5 , set LAN WIFI channel's value = WAN WIFI channel+5
    			lan_channel = atoi(lan_wifi_channel);
    			wan_channel = atoi(wan_wifi_channel);
    			range_channel = lan_channel > wan_channel  ? lan_channel  - wan_channel : wan_channel - lan_channel;
    
    			my_printf(LOG_MODE_LEVEL_3, "%s(%d) lan_channel:%d wan_channel:%d range_channel:%d\n",__FUNCTION__,__LINE__,lan_channel, wan_channel,range_channel);  
    			if(range_channel <= 5)
    			{ 
    				if (wan_channel >=lan_channel)
    				{ 
    					if((wan_channel+5) > MAX_CHANNEL)
    					{ 
    						wan_channel = (wan_channel+5)-MAX_CHANNEL;// wan channel > lan channel should set range to 5
    					}
    					else
    					{ 
    						wan_channel = (wan_channel+5);
    					}
    				}
    				else if (wan_channel <=lan_channel)
    				{ 
    					if((lan_channel+5) > MAX_CHANNEL)
    					{ 
    						wan_channel = (lan_channel+5)-MAX_CHANNEL;//should set range to 5
    					}
    					else
    					{ 
    						wan_channel = (lan_channel+5);
    					}
    				}
    				snprintf(cmd, sizeof(cmd), "iwpriv ra0 set Channel=%d", wan_channel);
    				my_printf(LOG_MODE_LEVEL_3, "%s(%d)cmd:%s\n",__FUNCTION__,__LINE__, cmd);
    				
    				pthread_mutex_lock(&pApp->confmutex);
    				system(cmd);
    				pthread_mutex_unlock(&pApp->confmutex);
    			}
    		}
    
    	}
    
    	return NULL;
    }
    
    void start_sync_channel_thread(void)
    { 
    	my_printf(LOG_MODE_LEVEL_3, " %s(%d) start_sync_channel_thread\n",__FUNCTION__,__LINE__);
    
    	int sync_channel_thread_ret;
    
    	pthread_attr_init(&sync_channel_attr);
    	pthread_attr_setdetachstate(&sync_channel_attr, PTHREAD_CREATE_DETACHED);
    	sync_channel_thread_ret = pthread_create(&sync_channel_thread, &sync_channel_attr, task_sync_wifi_channel_thread, NULL);
    
    	if (sync_channel_thread_ret != 0)
    	{            
    		my_printf(LOG_MODE_LEVEL_1, " %s(%d) task_sync_wifi_channel_thread pthread_create error!!\n",__FUNCTION__,__LINE__);
    	}
    
    }
    
    void stop_sync_channel_thread(void)
    { 
    	pthread_attr_destroy(&sync_channel_attr);
    }
    
    #endif