判断经过batman-adv协议的mesh自组网拓扑节点设备个数

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已于 2022-08-26 18:12:53 修改

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分类专栏： openwrt 文章标签： macos 网络 linux

于 2022-08-02 17:02:13 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_39035140/article/details/126125432

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记录：判断经过batman-adv协议的mesh自组网拓扑节点设备个数

1、可以通过二层网络工具包batctl确定与当前节点无线组网的节点个数，batctl n命令可以展示当前节点无线组网的邻居节点的mac地址
在这里插入图片描述

2、但是面临一个问题是不够准确，断掉一个设备很长时间里还是会在列表中出现，为了解决这个问题就用了ping的方式来实时判断设备在线与否

pox_system("iw mesh0 mpath dump|awk {'print $2'}|sort -u |grep -v ADDR > /tmp/mesh0");

    modefd = popen("uci get wireless.default_radio0.mode", "r");

    if (fgets(mac_line, 256, modefd) != NULL) 
	{
        mac_line[strlen(mac_line) - 1] = '\0';
    }

    pclose(modefd);
    //mode is mesh
    if (strcmp(mac_line,"mesh") == 0)
    {
        info = fopen("/tmp/mesh0", "r");

        if (NULL != info)
        {
            memset(mac_buf, 0, sizeof(mac_buf));
            memset(line, 0, sizeof(line));
            while (fgets(line, _LINE_LENGTH, info) != NULL)
            {
                *(line + strlen(line) -1) = '\0';
                 //Check whether the MAC address is correct
                if ((strlen(line) != 17) && (line[2] != ':') && (line[5] != ':'))
                {                                                                                                                                                                                           
                    break;
                }

                strcat(mac_buf, line);

                sprintf(node_buf, "batctl ping -c 3 %s|grep packets|awk {'print $6'}", line);

                fd = popen(node_buf,"r");
                if ( NULL == fd )
                {
                    debug(LOG_DEBUG, "ping other node fail,mac_buf host is not online");

                }

                memset(str, 0, sizeof(str));
                if (fgets(str, sizeof(str), fd) == NULL)
                {
                    debug(LOG_DEBUG,"the results of ping error!");
                }
                else
                {
                    str[strlen(str) - 1] = '\0';
                    if (strcmp(str, "100%") == 0)
					{
                        debug(LOG_DEBUG, "device in offline");
                    }
                    else
                    {
                        device_count++; //The number of Nodes in the Network
                    }
                }
                pclose(fd);
            }

        }
        else
        {
            debug(LOG_DEBUG, "popen iw mesh0 mpath dump is NULL.");
        }

            fclose(info);
    }
    else //mode is ap/station
    {
        device_count = 0;                                                                                                                                                                                   
    }

3、但是后续组网设备数量过多（二三十台以上）会有网络环路问题，思考如何既能实时显示又能减少网络负担，所以根据最后一次收到包的时间来判断设备是否在线
在这里插入图片描述

        FILE *time_info;
        pox_system("batctl n |awk {'print $2'} |grep -v Neighbor > /tmp/recvpak_time");
        time_info = fopen("/tmp/recvpak_time", "r");
        if (NULL != time_info)
        {   
            memset(line, 0, sizeof(line));
            while (fgets(line, _LINE_LENGTH, time_info) != NULL)
            {   
                *(line + strlen(line) -1) = '\0';
                recvtime = strtod(line, NULL);
                if (recvtime < 15) 
                {   
                    device_count++;
                }   
                memset(line, 0, sizeof(line));
            }   
        }   
        else
        {   
            debug(LOG_DEBUG, "batctl n get neighbor node time is NULL!");
        }   

        fclose(time_info);