文章摘要
这篇文章介绍了一个使用Go语言实现的端口扫描工具。该工具通过注册Go语言命令在启动时启动端口监听功能，并每隔一秒检查是否有新的端口被启用。当发现新端口时，会在浏览器中打开提示对话框，询问用户是否在浏览器中打开该端口，以便代理服务器能够访问容器的指定端口。文章的核心内容是该工具的启动、端口扫描和用户交互功能。
FROM golang
WORKDIR /workspace
RUN cp /usr/local/go/bin
function activate(context) {
// Use the console to output diagnostic information (console.log) and errors (console.error)
// This line of code will only be executed once when your extension is activated
// The command has been defined in the package.json file
// Now provide the implementation of the command with registerCommand
// The commandId parameter must match the command field in package.json
let disposable=vscode.commands.registerCommand(‘port-finder.helloWorld’, function () {
// The code you place here will be executed every time your command is executed
// Display a message box to the user
vscode.window.showInformationMessage(‘Hello World from port_finder!’);
});
context.subscriptions.push(disposable);
initGetPorts()
}
var s=new Set()
function initGetPorts() {
getListeningPorts(function(ports) {
ports.forEach(p=> {
s.add(p)
})
setInterval(function() { // 设置定时器，每隔一秒获取一次
listenPortChange()
}, 1000)
})
}
function listenPortChange() {
// 获取处于LISTEN状态的端口
getListeningPorts(function(ports) {
var tmpSet=new Set()
ports.forEach(p=> {
if (!s.has(p)) {
// 发现新的端口被监听就提醒用户是否在浏览器中打开
vscode.window.showInformationMessage(“发现新开启的端口:” + p + “,是否在浏览器中访问?”, “是”, “否”, “不再提示”)
.then(result=> {
if (result===”是”) {
// 在浏览器中打开来访问代理服务器，后面带上端口信息，以便代理服务器知道访问容器的哪个端口
vscode.env.openExternal(vscode.Uri.parse(`http://192.168.44.100/proxy/` + p))
}
})
}
tmpSet.add(p)
})
s=tmpSet
})
}
function getListeningPorts(callback) {
var exec=require(‘child_process’).exec;
exec(‘netstat -nlt’, function(error, stdout, stderr){
if(error) {
console.error(‘error: ‘ + error);
return;
}
var ports=parsePort(stdout)
callback(ports)
})
}
function parsePort(msg) {
var idx=msg.indexOf(“tcp”)
msg=msg.slice(idx, msg.length)
var colums=msg.split(“\n”)
var ret=new Array()
colums=colums.slice(0, colums.length – 1)
colums.forEach(element=> {
var port=findPort(element)
if (port !=-1) {
ret.push(port)
}
});
return ret;
}
function findPort(colum) {
var idx=colum.indexOf(‘:’)
var first=colum.slice(0, idx)
while (colum[idx]==’:’) {
idx++
}
var second=colum.slice(idx, colum.length)
var fidx=first.lastIndexOf(‘ ‘)
var sidx=second.indexOf(‘ ‘)
var ip=first.slice(fidx + 1, first.length)
var port=second.slice(0, sidx)
if (ip==”127.0.0.1″) {
return -1
} else {
return Number(port)
}
}
// this method is called when your extension is deactivated
function deactivate() {}
module.exports={
activate,
deactivate
}