PowerShell小技巧之获取TCP响应(类Telnet)
PowerShell小技巧之获取TCP响应(类Telnet)
发布时间:2016-12-28 来源:查字典编辑
摘要:通常情况下,为了检测指定的TCP端口是否存活,我们都是通过telnet指定的端口看是否有响应来确定,然而默认情况下win8以后的系统默认是不...

通常情况下,为了检测指定的TCP端口是否存活,我们都是通过telnet指定的端口看是否有响应来确定,然而默认情况下win8以后的系统默认是不安装telnet的。设想一下如果你黑进了一个服务器,上面没装telnet,但是为了进一步渗透进内网,需要探测内部服务器特定端口是否打开,同时你还不愿意安装telnet,担心引起管理员注意。那么好吧,在这个情况下你需要我的这个脚本。由于它是原生态的PowerShell语句完成,木有telnet你也照样能检测TCP端口的情况了。

下面首先上代码,后面进行讲解:

复制代码 代码如下:

=====文件名:Get-TCPResponse.ps1=====

Function Get-TCPResponse {

<# Author:fuhj(powershell#live.cn ,http://fuhaijun.com)

.SYNOPSIS

Tests TCP port of remote or local system and returns a response header

if applicable

.DESCRIPTION

Tests TCP port of remote or local system and returns a response header

if applicable

If server has no default response, then Response property will be NULL

.PARAMETER Computername

Local or remote system to test connection

.PARAMETER Port

TCP Port to connect to

.PARAMETER TCPTimeout

Time until connection should abort

.EXAMPLE

Get-TCPResponse -Computername pop.126.com -Port 110

Computername : pop.126.com

Port : 110

IsOpen : True

Response : +OK Welcome to coremail Mail Pop3 Server (126coms[75c606d72bf436dfbce6.....])

Description

-----------

Checks port 110 of an mail server and displays header response.

#>

[OutputType('Net.TCPResponse')]

[cmdletbinding()]

Param (

[parameter(ValueFromPipeline,ValueFromPipelineByPropertyName)]

[Alias('__Server','IPAddress','IP','domain')]

[string[]]$Computername = $env:Computername,

[int[]]$Port = 25,

[int]$TCPTimeout = 1000

)

Process {

ForEach ($Computer in $Computername) {

ForEach ($_port in $Port) {

$stringBuilder = New-Object Text.StringBuilder

$tcpClient = New-Object System.Net.Sockets.TCPClient

$connect = $tcpClient.BeginConnect($Computer,$_port,$null,$null)

$wait = $connect.AsyncWaitHandle.WaitOne($TCPtimeout,$false)

If (-NOT $wait) {

$object = [pscustomobject] @{

Computername = $Computer

Port = $_Port

IsOpen = $False

Response = $Null

}

} Else {

While ($True) {

#Let buffer

Start-Sleep -Milliseconds 1000

Write-Verbose "Bytes available: $($tcpClient.Available)"

If ([int64]$tcpClient.Available -gt 0) {

$stream = $TcpClient.GetStream()

$bindResponseBuffer = New-Object Byte[] -ArgumentList $tcpClient.Available

[Int]$response = $stream.Read($bindResponseBuffer, 0, $bindResponseBuffer.count)

$Null = $stringBuilder.Append(($bindResponseBuffer | ForEach {[char][int]$_}) -join '')

} Else {

Break

}

}

$object = [pscustomobject] @{

Computername = $Computer

Port = $_Port

IsOpen = $True

Response = $stringBuilder.Tostring()

}

}

$object.pstypenames.insert(0,'Net.TCPResponse')

Write-Output $object

If ($Stream) {

$stream.Close()

$stream.Dispose()

}

$tcpClient.Close()

$tcpClient.Dispose()

}

}

}

}

首先创建一个System.Net.Sockets.TCPClient对象,去连接指定的域名和端口,瞬间断开的那是服务器没开那个端口,直接被拒绝了,如果没拒绝,那就等着服务器端给你响应,然后读取字节流拼接起来进行解析。

最后需要强调的是需要对打开的流和TCP连接进行关闭,以便释放资源

调用方法如下:

复制代码 代码如下:

Get-TCPResponse -Computername pop.126.com -Port 110

PowerShell小技巧之获取TCP响应(类Telnet)1

再对比一下telnet的结果

PowerShell小技巧之获取TCP响应(类Telnet)2

结果是一样的,以后没有telnet也难不住大家了,have fun!^_^

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