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(Objective-C) 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--".

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import <CkoSsh.h>
#import <CkoStringArray.h>
#import <CkoStringBuilder.h>

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

CkoSsh *ssh = [[CkoSsh alloc] init];

BOOL success = [ssh Connect: @"SSH_SERVER_DOMAIN_OR_IP_ADDRESS" port: [NSNumber numberWithInt: 22]];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Authenticate using login/password:
success = [ssh AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Start a shell session.
int channelNum = [[ssh QuickShell] intValue];
if (channelNum < 0) {
    NSLog(@"%@",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: [NSNumber numberWithInt: channelNum] matchPattern: @">" charset: @"utf-8" caseSensitive: YES];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Show what we received so far:
NSLog(@"%@",[ssh GetReceivedText: [NSNumber numberWithInt: channelNum] charset: @"utf-8"]);

// Send the "ena" command to enable privileged mode.
// (For the Cisco switch, terminate command with a single CR char.)
success = [ssh ChannelSendString: [NSNumber numberWithInt: channelNum] strData: @"ena\r" charset: @"utf-8"];
// Assume success for this example to make it shorter..

// Read to the "Password:" prompt.
success = [ssh ChannelReceiveUntilMatch: [NSNumber numberWithInt: channelNum] matchPattern: @"Password:" charset: @"utf-8" caseSensitive: YES];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Show what we received...
NSLog(@"%@",[ssh GetReceivedText: [NSNumber numberWithInt: channelNum] charset: @"utf-8"]);

// Send the password.
success = [ssh ChannelSendString: [NSNumber numberWithInt: channelNum] strData: @"MY_PASSWORD_FOR_ELEVATED_PRIVILEGE\r" charset: @"utf-8"];

// The prompt now changes from "Something>" to "Something#>
// Read until the new prompt..
success = [ssh ChannelReceiveUntilMatch: [NSNumber numberWithInt: channelNum] matchPattern: @"#" charset: @"utf-8" caseSensitive: YES];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Show what we received...
NSLog(@"%@",[ssh GetReceivedText: [NSNumber numberWithInt: channelNum] charset: @"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: [NSNumber numberWithInt: channelNum] strData: @"show running-config\r" charset: @"utf-8"];

// Consume the response until we end with another prompt.
CkoStringArray *saMatch = [[CkoStringArray alloc] init];
// 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--"];

CkoStringBuilder *sbReceived = [[CkoStringBuilder alloc] init];
BOOL moreComing = YES;
while ((moreComing == YES)) {

    success = [ssh ChannelReceiveUntilMatchN: [NSNumber numberWithInt: channelNum] matchPatterns: saMatch charset: @"utf-8" caseSensitive: YES];
    if (success != YES) {
        NSLog(@"%@",ssh.LastErrorText);
        return;
    }

    moreComing = NO;

    [sbReceived Clear];
    [sbReceived Append: [ssh GetReceivedText: [NSNumber numberWithInt: channelNum] charset: @"utf-8"]];

    NSLog(@"%@",[sbReceived GetAsString]);

    if ([sbReceived Contains: @"--More--" caseSensitive: YES] == YES) {
        moreComing = YES;

        // Send a SPACE char just as if we were interactively pressing the SPACE key to get more output.
        success = [ssh ChannelSendString: [NSNumber numberWithInt: channelNum] strData: @" " charset: @"utf-8"];
    }

}

[ssh Disconnect];
 

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