C#

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--". C#

bool success = false;

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

Chilkat.Ssh ssh = new Chilkat.Ssh();

success = ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
if (success != true) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

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

// Start a shell session.
int channelNum = ssh.QuickShell();
if (channelNum < 0) {
    Debug.WriteLine(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) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

// Show what we received so far:
Debug.WriteLine(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) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

// Show what we received...
Debug.WriteLine(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) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

// Show what we received...
Debug.WriteLine(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.
Chilkat.StringArray 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--");

Chilkat.StringBuilder sbReceived = new Chilkat.StringBuilder();
bool moreComing = true;
while ((moreComing == true)) {

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

    moreComing = false;

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

    Debug.WriteLine(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();