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

#include <C_CkSsh.h>
#include <C_CkStringArray.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSsh ssh;
    int channelNum;
    HCkStringArray saMatch;
    HCkStringBuilder sbReceived;
    BOOL moreComing;

    success = FALSE;

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

    ssh = CkSsh_Create();

    success = CkSsh_Connect(ssh,"SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Authenticate using login/password:
    success = CkSsh_AuthenticatePw(ssh,"myLogin","myPassword");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Start a shell session.
    channelNum = CkSsh_QuickShell(ssh);
    if (channelNum < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        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 = CkSsh_ChannelReceiveUntilMatch(ssh,channelNum,">","utf-8",TRUE);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Show what we received so far:
    printf("%s\n",CkSsh_getReceivedText(ssh,channelNum,"utf-8"));

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

    // Read to the "Password:" prompt.
    success = CkSsh_ChannelReceiveUntilMatch(ssh,channelNum,"Password:","utf-8",TRUE);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Show what we received...
    printf("%s\n",CkSsh_getReceivedText(ssh,channelNum,"utf-8"));

    // Send the password.
    success = CkSsh_ChannelSendString(ssh,channelNum,"MY_PASSWORD_FOR_ELEVATED_PRIVILEGE\r","utf-8");

    // The prompt now changes from "Something>" to "Something#>
    // Read until the new prompt..
    success = CkSsh_ChannelReceiveUntilMatch(ssh,channelNum,"#","utf-8",TRUE);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Show what we received...
    printf("%s\n",CkSsh_getReceivedText(ssh,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 = CkSsh_ChannelSendString(ssh,channelNum,"show running-config\r","utf-8");

    // Consume the response until we end with another prompt.
    saMatch = CkStringArray_Create();
    // 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...
    CkStringArray_Append(saMatch,"YOUR_PROMPT#");
    CkStringArray_Append(saMatch,"--More--");

    sbReceived = CkStringBuilder_Create();
    moreComing = TRUE;
    while ((moreComing == TRUE)) {

        success = CkSsh_ChannelReceiveUntilMatchN(ssh,channelNum,saMatch,"utf-8",TRUE);
        if (success != TRUE) {
            printf("%s\n",CkSsh_lastErrorText(ssh));
            CkSsh_Dispose(ssh);
            CkStringArray_Dispose(saMatch);
            CkStringBuilder_Dispose(sbReceived);
            return;
        }

        moreComing = FALSE;

        CkStringBuilder_Clear(sbReceived);
        CkStringBuilder_Append(sbReceived,CkSsh_getReceivedText(ssh,channelNum,"utf-8"));

        printf("%s\n",CkStringBuilder_getAsString(sbReceived));

        if (CkStringBuilder_Contains(sbReceived,"--More--",TRUE) == TRUE) {
            moreComing = TRUE;

            // Send a SPACE char just as if we were interactively pressing the SPACE key to get more output.
            success = CkSsh_ChannelSendString(ssh,channelNum," ","utf-8");
        }

    }

    CkSsh_Disconnect(ssh);


    CkSsh_Dispose(ssh);
    CkStringArray_Dispose(saMatch);
    CkStringBuilder_Dispose(sbReceived);

    }