PowerShellTelnetRemoteSession.ps1

## PowerShell: Script To Telnet To Remote Hosts And Run Commands Against Them With Output To A File ##
## Overview: Useful for Telnet connections to Cisco Switches and other devices. Can add additional command strings
## Usage Examples: Add your environment specific details into the parameters below, or include when calling the script:
## In this script it  1. change Ethernet NIC to static IP - 2. connects to Zyxel VMG1312-B10A and configure device-  3.change Ethernet NIC to DHCP 
## Contributer "Chrisdee" https://github.com/chrisdee/Scripts/blob/master/PowerShell/Working/telnet/PowerShellTelnetRemoteSession.ps1
## Modified "jespernohr@gmail.com"

param(
    [string] $remoteHost = "192.168.1.1", 
    [int] $port = 23,
    [string] $username = "admin",
    [string] $password = "1234",       
    [string] $enablepassword = "",
    [string] $command1 = "wlan config --status primary disable",
    [string] $command2 = "wan edit servicename VDSL toBridge",
    [string] $command3 = "dhcpserver disable",
    [string] $command4 = "firewall config disable",
    [string] $command5 = "save",
    [string] $command6= "logout",
    [int] $commandDelay = 2000
   )
 
[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 1000
 
    ## 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 "Connecting to $remoteHost on port $port"
 
  trap { Write-Error "Could not connect to remote computer: $_"; exit }
  $socket = new-object System.Net.Sockets.TcpClient($remoteHost, $port)
 
  write-host "Connected. Please Wait for Job to Finish....`n"
 
  $stream = $socket.GetStream()
 
  $writer = new-object System.IO.StreamWriter $stream

    ## Receive the output that has buffered so far
    $SCRIPT:output += GetOutput

            $writer.WriteLine($username)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($password)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($enablepassword)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command1)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command2)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command3)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command4)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command5)
        $writer.Flush()
        Start-Sleep -m $commandDelay
                $writer.WriteLine($command6) #Add additional entries below here for additional 'strings' you created above
        $writer.Flush()
        Start-Sleep -m $commandDelay
         

        $SCRIPT:output += GetOutput
                
 
 
  ## Close the streams
  $writer.Close()
  $stream.Close()
 
  $output | Out-File ("C:\$remoteHost.txt") #Change this to suit your environment
}


# Creates a variable for network adapter with descritip like "Gigabit"
$NIC = Get-WmiObject -Class "Win32_NetworkAdapterConfiguration" -Filter "Description LIKE '%Giga%'" 

# Uses variable to change Lan adapter to static IP adress.
$NIC.EnableStatic("192.168.1.10","255.255.255.0")

# Running main config
. Main

# Uses variable to change Lan adapter to dynamic IP adress.
$NIC.EnableDHCP()