Java

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--". Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

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

    CkSsh ssh = new CkSsh();

    success = ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Start a shell session.
    int channelNum = ssh.QuickShell();
    if (channelNum < 0) {
        System.out.println(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) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Show what we received so far:
    System.out.println(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) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Show what we received...
    System.out.println(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) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Show what we received...
    System.out.println(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.
    CkStringArray saMatch = new CkStringArray();
    // 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--");

    CkStringBuilder sbReceived = new CkStringBuilder();
    boolean moreComing = true;
    while ((moreComing == true)) {

        success = ssh.ChannelReceiveUntilMatchN(channelNum,saMatch,"utf-8",true);
        if (success != true) {
            System.out.println(ssh.lastErrorText());
            return;
            }

        moreComing = false;

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

        System.out.println(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();
  }
}