PowerShell

SSH to Cisco Switch - Processing "More" Responses

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Demonstrates connecting to a Cisco switch, running a command to enable privileged mode, then running a command to get a paged response requiring the SPACE char to be sent to process "--More--". PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$ssh = New-Object Chilkat.Ssh

$success = $ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Authenticate using login/password:
$success = $ssh.AuthenticatePw("myLogin","myPassword")
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Start a shell session.
$channelNum = $ssh.QuickShell()
if ($channelNum -lt 0) {
    $($ssh.LastErrorText)
    exit
}

# If the CISCO switch returns a prompt with ">", then read until we get the prompt.
# (It's not actually required that we do this, but it helps to know that all is OK at this point..)
$success = $ssh.ChannelReceiveUntilMatch($channelNum,">","utf-8",$true)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Show what we received so far:
$($ssh.GetReceivedText($channelNum,"utf-8"))

# Send the "ena" command to enable privileged mode.
# (For the Cisco switch, terminate command with a single CR char.)
$success = $ssh.ChannelSendString($channelNum,"ena`r","utf-8")
# Assume success for this example to make it shorter..

# Read to the "Password:" prompt.
$success = $ssh.ChannelReceiveUntilMatch($channelNum,"Password:","utf-8",$true)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Show what we received...
$($ssh.GetReceivedText($channelNum,"utf-8"))

# Send the password.
$success = $ssh.ChannelSendString($channelNum,"MY_PASSWORD_FOR_ELEVATED_PRIVILEGE`r","utf-8")

# The prompt now changes from "Something>" to "Something#>
# Read until the new prompt..
$success = $ssh.ChannelReceiveUntilMatch($channelNum,"#","utf-8",$true)
if ($success -ne $true) {
    $($ssh.LastErrorText)
    exit
}

# Show what we received...
$($ssh.GetReceivedText($channelNum,"utf-8"))

# Send the "show running-config" command.
# The response will be in multiple pages, each ending with "--More--" and requiring a SPACE bar to be sent
# to get the next page.
$success = $ssh.ChannelSendString($channelNum,"show running-config`r","utf-8")

# Consume the response until we end with another prompt.
$saMatch = New-Object Chilkat.StringArray
# Change "YOUR_PROMPT" to your actual prompt.  We don't want to check for only "#" because
# it's not specific enough.  The data in the response could contain the "#" char...
$saMatch.Append("YOUR_PROMPT#")
$saMatch.Append("--More--")

$sbReceived = New-Object Chilkat.StringBuilder
$moreComing = $true
while (($moreComing -eq $true)) {

    $success = $ssh.ChannelReceiveUntilMatchN($channelNum,$saMatch,"utf-8",$true)
    if ($success -ne $true) {
        $($ssh.LastErrorText)
        exit
    }

    $moreComing = $false

    $sbReceived.Clear()
    $sbReceived.Append($ssh.GetReceivedText($channelNum,"utf-8"))

    $($sbReceived.GetAsString())

    if ($sbReceived.Contains("--More--",$true) -eq $true) {
        $moreComing = $true

        # Send a SPACE char just as if we were interactively pressing the SPACE key to get more output.
        $success = $ssh.ChannelSendString($channelNum," ","utf-8")
    }

}

$ssh.Disconnect()