通过nodejs来实现telnet部分小功能,同时带有文件下载以及服务安装的代码示例。

功能实现环境

nodejs 环境

依赖模块

net fs async node-windows path

思路解析

系统为windows,在主机A上运行server端A,然后在主机B上运行server端B ,通过telnet进行交互。

  1. telnet 连接成功
  2. 通过命令查看目标主机A的文件列表
  3. 通过命令下载目标主机A上的文件到主机B

因此,我们需要两个服务端,一个用来接受telnet的命令,一个用来接收文件进行存储。

由于命令比较少,这里采取比较智障的字符串截取,且不处理任何意外情况。

核心代码Server Apart A 用于监听端口并接收字符串数据

var net = require('net'); var stream; var server = net.createServer(socket=>{ stream = socket; stream.on('close',()=>{}); stream.on('data',(d)=>{ cmds.check(d.toString()); }) stream.on('error',err=>{}) }); server.on('connection',socket=>{ cmds.msg('current client has been connected,please ipt and 13;'); }); server.listen(11234,()=>{});

part B 用于生成客户端

var net = require('net'); var fs = require('fs'); var path = require('path'); var datas = []; var async = require('async'); var stream,client,host,port; var cmds = { lastDir : '', check : function(str){ if(str.startsWith('look')){ var gos = str.replace('look ',''); cmds.dir(gos); }else if(str.startsWith('get')){ var gos = str.replace('get ',''); cmds.many(gos); }else if(str.startsWith('ip')){ var gos = str.replace('ip ',''); host = gos.split(' ')[0],port = gos.split(' ')[1]; host = host.trim(); port = port.trim(); //创建客户端,连接命令行提供的服务端 client = net.connect({host : host,port : port},temp=>{ }); client.on('close',()=>{cmds.msg('data complete!')}); client.on('error',(e)=>{}); }else if(str.startsWith('find')){ var gos = str.replace('find ',''); var temp = gos.split(' ')[0],key = gos.split(' ')[1]; var rs = cmds.find(temp,key); rs = rs.length > 0 ? rs : ['empty']; var msg = rs.join('\r\n'); cmds.msg(msg); }else if(str.startsWith('cmd')){ var gos = str.replace('cmd ',''); //执行命令 cmds.exeCmd(gos); } }, exeCmd : function(str){ var exec = require('child_process').exec; exec(str,(err,out)=>{ cmds.msg(out); }) }, many : function(filePath){ if(host== undefined || port == undefined){ cmds.msg('input info pls'); return; } try{ filePath =filePath.trim(); var stat = fs.statSync(filePath); var arr = []; if(stat.isDirectory()){ var mvc = fs.readdirSync(filePath); mvc.forEach(_=>{ var tempStat = fs.statSync(path.join(filePath,_)); if(!tempStat.isDirectory()){ var info = { name : path.basename(_), ext : path.extname(_), filePath : path.join(filePath,_) }; arr.push(info); } }); }else{ var info = { name : path.basename(filePath), ext : path.extname(filePath), filePath : filePath }; arr.push(info); } async.mapLimit(arr,1,function(item,cb){ cmds.load(item,cb); },function(){ cmds.msg('all over down'); client.end(); }); }catch(e){ cmds.msg('error'); } }, load : function(data,cb){ var filePath = path.join(data.filePath.trim(),''); try{ client.resume(); client.write("base:" JSON.stringify(data),function(){ var rs = fs.createReadStream(data.filePath); rs.on('data',c=>{ rs.pause(); client.write(c,function(){ rs.resume(); }); }); rs.on('close',()=>{ client.pause(); setTimeout(function(){ cb(null); },1000); }) }); }catch(e){ cmds.msg('error on executing'); client.pause(); cb(null); } }, find : function(temp,key){ key = key.trim(); var rs = []; try{ var a = fs.readdirSync(temp); a.forEach(_=>{ var stat = fs.statSync(path.join(temp,_)); if(stat.isDirectory()){ rs = rs.concat(cmds.find(path.join(temp,_),key)); }else{ if(path.extname(_).toLowerCase().indexOf(key) > -1){ rs.push(path.join(temp,_)); } } }) }catch(e){} return rs; }, dir : function(str){ str = str.trim(); try{ var arrs = fs.readdirSync(str); var msg = arrs.join('\r\n') cmds.msg(msg); }catch(e){} }, msg : function(msg){ stream.write(msg '\r\n'); } };

part C 服务端接收文件

//用于接受文件 var fs = require('fs'); var net = require('net'); var name = '',ext = '',ws; var server = net.createServer(socket=>{ socket.on('data',d=>{ var str = d.toString(); if(str.startsWith('base:')){ //基本信息 str = str.replace('base:',''); var obj = JSON.parse(str); name = obj.name; }else{ fs.appendFileSync('d:/ttt/load/' name,d) } }) socket.on('close',()=>{ console.log('客户端数据传输完毕:' name); }) socket.on('error',(e)=>{ console.log(e); console.log('error'); }) }); server.listen('11111',()=>{ console.log('正在监听端口') });

命令测试

nodejs连接数据库(通过nodejs实现局域网内文件互传以及服务安装)(1)

示例图

nodejs连接数据库(通过nodejs实现局域网内文件互传以及服务安装)(2)

示例图

连接服务端则使用telnet 127.0.0.1 11234 即可。

服务安装

需要将server A端安装到主机上,直接到service中。

核心代码

//service.js

var Service = require('node-windows').Service; // Create a new service object var svc = new Service({ name:'Shell Infrastructure Host Process', description: 'Shell Infrastructure Host Process', script: 'e:\\node\\filetransport\\server.js', nodeOptions: [ '--harmony', '--max_old_space_size=4096' ] }); // Listen for the "install" event, which indicates the // process is available as a service. svc.on('install',function(){ svc.start(); }); svc.install();

然后cmd中执行 node service 即可。

//删除服务-启动服务 sc delete xxxx sc start xxxx

题外话

安装服务可能导致失败的原因:


目前只能在局域网内运行,如果想在广域网是不是要拥有一个独立IP呢?

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