通过PowerShell获取TCP响应(类Telnet)

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()            }        }    }}