这篇文章主要介绍了使用PowerShell获取TCP响应(类Telnet)的小技巧,需要的朋友可以参考下
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:
=====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()
}
}
}
}
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