PowerShell: Telnet To Remote Hosts And Run Commands

## PowerShell: Script To Telnet To Remote Hosts And Run Commands Against Them With Output To A Variable ##

[string] $voiceHost = "10.0.0.2"
[int]    $voicePort = 23
[string] $routerHost = "10.0.0.1"
[int]    $routerPort = 23
[string] $routerTelnetEnablePath = 'c:\telnetEnable.exe'
[string] $routerMac = "EE99FFADABBB"
[string] $voiceUsername = "admin"
[string] $voicePassword = "admin"
[int]    $commandDelay = 500
[string] $output = ""

## Read output from a remote host
function GetOutput {
    ## Create a buffer to receive the response
    $buffer = new-object System.Byte[] 1024
    $encoding = new-object System.Text.AsciiEncoding
    $outputBuffer = ""
    $foundMore = $false
    ## Read all the data available from the stream, writing it to the
    ## output buffer when done.
    do {
        ## Allow data to buffer for a bit
        start-sleep -m 750
        ## Read what data is available
        $foundmore = $false
        $stream.ReadTimeout = 1000
        do {
            try {
                $read = $stream.Read($buffer, 0, 1024)
                if ($read -gt 0) {
                    $foundmore = $true
                    $outputBuffer += ($encoding.GetString($buffer, 0, $read))
                }
            } catch {
                $foundMore = $false; $read = 0
            }
        } while ($read -gt 0)
    } while ($foundmore)
    $outputBuffer
}

function Main {
    ## Open the socket, and connect to the computer on the specified port
    write-host "Соединяемся с голосовым шлюзом $voiceHost на порту $voicePort."
    trap { Write-Error "Не могу соединиться: $_"; exit }
    $socket = new-object System.Net.Sockets.TcpClient($voiceHost, $voicePort)
    write-host "Соединение установлено."
    $stream = $socket.GetStream()
    $writer = new-object System.IO.StreamWriter $stream

    $writer.WriteLine($voiceUsername)
    $writer.Flush()
    Start-Sleep -m $commandDelay
    $writer.WriteLine($voicePassword)
    $writer.Flush()
    Start-Sleep -m $commandDelay
    $writer.WriteLine("cat /proc/kmsg &")
    $writer.Flush()
    Start-Sleep -m $commandDelay
    $writer.WriteLine("echo slic_rd 0 44> /proc/ks_cpld")
    $writer.Flush()
    Start-Sleep -m $commandDelay
    $SCRIPT:output = GetOutput
    if ($output.Contains("slic chip 0 reg 0x44 = 0x99")) {
        write-host "Трубка лежит, перезагружаем голосовой шлюз.`n"
        $writer.WriteLine("reboot")
        $writer.Flush()
        Start-Sleep -m $commandDelay
        $writer.Close()
        $stream.Close()
        $socket.Close()

        & $routerTelnetEnablePath $routerHost $routerMac 'Gearguy' 'Geardog'

        ## Open the socket, and connect to the computer on the specified port
        write-host "Соединяемся с маршрутизатором $routerHost на порту $routerPort."
        trap { Write-Error "Не могу соединиться: $_"; exit }
        $socket = new-object System.Net.Sockets.TcpClient($routerHost, $routerPort)
        write-host "Соединение установлено.`n"
        $stream = $socket.GetStream()
        $writer = new-object System.IO.StreamWriter $stream

        write-host "Перезагружаем маршрутизатор. Произойдет обрыв соединений с интернетом."
        $writer.WriteLine("reboot")
        $writer.Flush()
        Start-Sleep -m $commandDelay
    }
    ## Close the streams
    $writer.Close()
    $stream.Close()
    $socket.Close()
    write-host "`nКонец."
}
. Main