(Node.js) SSH to Cisco Switch - Processing "More" Responses

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--".

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var ssh = new chilkat.Ssh();

    var success = ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
    if (success !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("myLogin","myPassword");
    if (success !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Start a shell session.
    var channelNum = ssh.QuickShell();
    if (channelNum < 0) {
        console.log(ssh.LastErrorText);
        return;
    }

    // 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 !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Show what we received so far:
    console.log(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 !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Show what we received...
    console.log(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 !== true) {
        console.log(ssh.LastErrorText);
        return;
    }

    // Show what we received...
    console.log(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.
    var saMatch = new 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--");

    var sbReceived = new chilkat.StringBuilder();
    var moreComing = true;
    while ((moreComing == true)) {

        success = ssh.ChannelReceiveUntilMatchN(channelNum,saMatch,"utf-8",true);
        if (success !== true) {
            console.log(ssh.LastErrorText);
            return;
        }

        moreComing = false;

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

        console.log(sbReceived.GetAsString());

        if (sbReceived.Contains("--More--",true) == 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();

}

chilkatExample();