Perl

SSH to Cisco Switch - Processing "More" Responses

See more SSH Examples

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--". Perl

use chilkat();

$success = 0;

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

$ssh = chilkat::CkSsh->new();

$success = $ssh->Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Authenticate using login/password:
$success = $ssh->AuthenticatePw("myLogin","myPassword");
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Start a shell session.
$channelNum = $ssh->QuickShell();
if ($channelNum < 0) {
    print $ssh->lastErrorText() . "\r\n";
    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",1);
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Show what we received so far:
print $ssh->getReceivedText($channelNum,"utf-8") . "\r\n";

# 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",1);
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Show what we received...
print $ssh->getReceivedText($channelNum,"utf-8") . "\r\n";

# 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",1);
if ($success != 1) {
    print $ssh->lastErrorText() . "\r\n";
    exit;
}

# Show what we received...
print $ssh->getReceivedText($channelNum,"utf-8") . "\r\n";

# 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 = chilkat::CkStringArray->new();
# 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 = chilkat::CkStringBuilder->new();
$moreComing = 1;
while (($moreComing == 1)) {

    $success = $ssh->ChannelReceiveUntilMatchN($channelNum,$saMatch,"utf-8",1);
    if ($success != 1) {
        print $ssh->lastErrorText() . "\r\n";
        exit;
    }

    $moreComing = 0;

    $sbReceived->Clear();
    $sbReceived->Append($ssh->getReceivedText($channelNum,"utf-8"));

    print $sbReceived->getAsString() . "\r\n";

    if ($sbReceived->Contains("--More--",1) == 1) {
        $moreComing = 1;

        # 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();