openwrt 显示客户端client 连接的信息 /proc/net/arp /tmp/dhcp.leases

超、凢脫俗 2022-05-25 03:24 615阅读 0赞

**显示当前路由器上，client的name，ip，mac，connect\_type信息**

有两种方式：[来自链接][Link 1]  
一。通过DHCP client分配列表 (缺点：client列表会根据超时时间刷新，一般超时时间为12h,)  
二。通过arp缓存列表/proc/net/arp(缺点：arp刷新时间默认为30s,这个时间的误差可以接受。)

主要讲解第二种方法：  
Flags: 0x0是找不到这台主机了。  
0x2是主机还在线。

root@OpenWrt:/# cat /proc/net/arp 
    IP address       HW type     Flags       HW address            Mask     Device
    192.168.0.188    0x1         0x2         00:e0:4c:68:00:03     *        br-lan
    192.168.0.30     0x1         0x2         28:ed:6a:e9:ab:fb     *        br-lan
    root@OpenWrt:/#

root@OpenWrt:/# cat /tmp/dhcp.leases 
    1525722001 28:ed:6a:e9:ab:fb 192.168.0.30 lin-bo-de 01:28:ed:6a:e9:ab:fb
    root@OpenWrt:/#

**connect\_type**  
判断是否是通过WIFI链接的，从iwpriv ra0 show stacountinfo把mac记录下，对比mac是否存在，存在的话是通过WiFi链接的，否则的话不是

dmesg -c 　表示显示信息后，清除ring buffer中的内容。

char *strupr(char *str)
    {
        char *orign=str;
        for (; *str!='\0'; str++)
            *str = toupper(*str);
        return orign;
    }
    
    
    int IsWifi(char *MAC){
        char wifimac[BUF_SIZE_128]={0};
        char uppermac[BUF_SIZE_128]={0};
        char *commond1 = "dmesg -c|iwpriv ra0 show stacountinfo" ;
        char *commond2 = "dmesg | grep MAC -A 20 | awk '{print $3}' >/tmp/wifista.txt" ;
        system(commond1);   
        system(commond2);
        FILE* fd = fopen("/tmp/wifista.txt","r");
        if(fd < 0)
        {
            return -1;
        }
        strcpy(uppermac,strupr(MAC));
        while(fgets(wifimac, sizeof(wifimac), fd) != NULL)
        {
            if(strncmp(uppermac,wifimac,17) == 0)
                {
                    my_printf(1, "%s(%d) COMPARE SUCCESED wifiMAC is %s uppermac is %s \n",__FUNCTION__,__LINE__,wifimac,uppermac);
                    return TRUE;
                }
    
                my_printf(1, "%s(%d) wifiMAC is %s mac is %s \n",__FUNCTION__,__LINE__,wifimac,uppermac);
            }
    
    }

**MAC ， IP， NAME**  
分割cat /tmp/dhcp.leases ，获取

int get_net_arp_list(char* dst_arp_list)
    {
        FILE *f=NULL;
        //char buf[BUF_SIZE_1024] = {0};
        //char *buf = NULL;
        //buf = (char*)malloc(sizeof(char)*1024);
        if ((f = fopen("/proc/net/arp", "r")) != NULL)
        {
            fread(dst_arp_list,1,sizeof(char)*1024,f);
            //buffer = buf;
            //dst_dhcp_list = buf;
            my_printf(LOG_MODE_LEVEL_1, "%s(%d) dst_arp_list is %s \n",__FUNCTION__,__LINE__,dst_arp_list);
            fclose(f);
        }
        return 0;
    }

[Link 1]: https://blog.csdn.net/qianguozheng/article/details/28393145