使用PowerShell自动化Telnet

Question

如何编写PowerShell脚本来自动执行这组命令？

• telnet到一台机器，
• 执行几个命令，
• 分析在远程登录窗口中的输出，
• 基于该输出，发送几个命令

Answer 1

而不是尝试自动执行telnet可执行文件，只需创建套接字并发出命令，读回它们，然后根据这些命令做出决定。下面是一个简化的示例连接到我的本地Web服务器：

function test() { 
    $msg = [System.Text.Encoding]::ASCII.GetBytes("GET/HTTP/1.0`r`nHost: localhost`r`n`r`n") 
    $c = New-Object System.Net.Sockets.TcpClient("localhost", 80) 
    $str = $c.GetStream() 
    $str.Write($msg, 0, $msg.Length) 
    $buf = New-Object System.Byte[] 4096 
    $count = $str.Read($buf, 0, 4096) 
    [System.Text.Encoding]::ASCII.GetString($buf, 0, $count) 
    $str.Close() 
    $c.Close() 
} 

显然，你需要将它从80端口的变化，并通过用户名/密码，而不是一个Web请求头......不过这已经足够了让你开始。

Answer 2

我不会在这里用套接字做任何事情，因为你将需要实现至少部分的telnet规范。如果我记得，那个规范有点有趣。但是这里列出了一些.NET远程登录实现：C# Telnet Library，您可能可以直接从PowerShell调整或使用，就像Goyuix在他的答案中使用套接字代码一样。

Answer 3

确定这是不是最优雅的解决方案，而且它依赖于不寒而栗 VBscript的，但这里有云......

创建一个VBScript实际加快telnet会话，这是一个例子

set oShell = CreateObject("WScript.Shell") 
oShell.run("Telnet") 
WScript.Sleep 1000 
oShell.SendKeys("Open 127.0.0.1 23") 
WScript.Sleep 1000 
oShell.SendKeys("{Enter}") 
WScript.Sleep 1000 
oShell.SendKeys("n") 
WScript.Sleep 1000 
oShell.SendKeys("{Enter}") 
WScript.Sleep 1000 
oShell.SendKeys"MyName" 
WScript.Sleep 1000 
oShell.SendKeys("{Enter}") 
WScript.Sleep 1000 
oShell.SendKeys("MyPassword") 
WScript.Sleep 1000 
oShell.SendKeys("{Enter}") 
WScript.Sleep 1000 
oShell.SendKeys("MyCommand") 
WScript.Sleep 1000 
oShell.SendKeys("{Enter}") 
WScript.Sleep 1000 

然后使用PowerShell来调用脚本，并通过它，你希望在执行命令，在下面的例子中，这些命令存储在一个名为CommandList.txt

文件

function Connect-MyTelnet{ 
Param(
[string] $IPAddress, 
[string] $Port, 
[string] $UserName, 
[string] $Password, 
[string] $cmdlistPath 
) 
    ## - Setting default values: 
    if($port -eq $null){ $Port = "23"; }; 
    if($cmdlistPath -eq $null) { $CmdlistPath = 'c:\temp\cmdlist.txt'; }; 

    ## create vbscript file: MyTelnetSession.vbs 
    ## - For Microsoft Telnet: 
    $MyVBScript = @" 
        set oShell = CreateObject("WScript.Shell")`r`n 
        oShell.run("Telnet")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("Open $IPAddress $Port")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("{Enter}")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("n")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("{Enter}")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("$UserName")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("{Enter}")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("$Password")`r`n 
        WScript.Sleep 1000`r`n 
        oShell.SendKeys("{Enter}")`r`n 
        WScript.Sleep 1000`r`n 
       "@; 

    ## - Get file with telnet commands: 
    [array] $Cmdlist = Get-Content $cmdlistPath; 

    ## loop through and build each telnet command line: 
    foreach($cmd in $cmdlist) 
    { 
     ## - Build VBscript lines: 
     $MyVBScript += 'oShell.SendKeys("'+$cmd+'")'+"`r`n"; 
     $MyVBScript += "WScript.Sleep 1000`r`n"; 
     $MyVBScript += 'oShell.SendKeys("{Enter}")'+"`r`n"; 
     $MyVBScript += 'WScript.Sleep 1000'+"`r`n"; 
    } 

    ## - Close Telnet Session: 
     $MyVBScript += 'oShell.SendKeys(" QUIT")'+"`r`n"; 
     $MyVBScript += "WScript.Sleep 1000`r`n"; 
     $MyVBScript += 'oShell.SendKeys("{Enter}")'+"`r`n"; 
     $MyVBScript += 'WScript.Sleep 1000'+"`r`n"; 

    ## - Save and execute generated VBscript: 
    $MYVBScript | Out-File -FilePath c:\temp\MyTelnet.vbs -Encoding ASCII; 
    & c:\temp\MyTelnet.vbs 
}; Set-Alias ct Connect-MyTelnet; 

这应该做你的要求......

注意：不是我的解决方案，从this blog post发现我已经使用它一次或两次。