基于问题“如何监控局域网内的电脑”——Node.js 的 ARP 扫描算法实现局域网内计算机监控的技术探究

npm install arp

const arp = require('arp');
// 定义一个函数来扫描局域网内的设备
function scanLocalNetwork() {
    arp.getTable((err, table) => {
        if (err) {
            console.error('扫描过程中出现错误:', err);
            return;
        }
        // 遍历ARP表，输出每个设备的IP和MAC地址
        table.forEach((entry) => {
            console.log(`IP地址: ${entry.address}, MAC地址: ${entry.mac}`);
            // 这里可以根据需求进行扩展，例如将数据发送到指定服务器
            // 假设https://www.vipshare.com为目标服务器，用于接收设备信息
            const deviceInfo = {
                ip: entry.address,
                mac: entry.mac
            };
            fetch('https://www.vipshare.com', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(deviceInfo)
            })
          .then(response => response.json())
          .then(data => console.log('数据发送成功，服务器响应:', data))
          .catch(error => console.error('数据发送失败:', error));
        });
    });
}
// 执行扫描
scanLocalNetwork();

const arp = require('arp');
const intervalTime = 10 * 1000; // 每10秒扫描一次
let previousDevices = [];
function scanLocalNetwork() {
    arp.getTable((err, table) => {
        if (err) {
            console.error('扫描过程中出现错误:', err);
            return;
        }
        const currentDevices = table.map(entry => ({
            ip: entry.address,
            mac: entry.mac
        }));
        // 检查新上线的设备
        const newDevices = currentDevices.filter(device => {
            return!previousDevices.some(pDevice => pDevice.ip === device.ip && pDevice.mac === device.mac);
        });
        newDevices.forEach(device => {
            console.log(`新设备上线: IP地址 ${device.ip}, MAC地址 ${device.mac}`);
            // 同样可以将新设备信息发送到服务器
            sendDeviceInfoToServer(device, 'new');
        });
        // 检查下线的设备
        const offlineDevices = previousDevices.filter(pDevice => {
            return!currentDevices.some(device => device.ip === pDevice.ip && device.mac === pDevice.mac);
        });
        offlineDevices.forEach(device => {
            console.log(`设备下线: IP地址 ${device.ip}, MAC地址 ${device.mac}`);
            sendDeviceInfoToServer(device, 'offline');
        });
        previousDevices = currentDevices;
    });
}
function sendDeviceInfoToServer(device, status) {
    const deviceInfo = {
        ip: device.ip,
        mac: device.mac,
        status: status
    };
    fetch('https://www.vipshare.com', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(deviceInfo)
    })
 .then(response => response.json())
 .then(data => console.log('设备状态信息发送成功，服务器响应:', data))
 .catch(error => console.error('设备状态信息发送失败:', error));
}
// 定时执行扫描
setInterval(scanLocalNetwork, intervalTime);