Go

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--". Go

    success := false

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

    ssh := chilkat.NewSsh()

    success = ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22)
    if success != true {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        return
    }

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

    // Start a shell session.
    channelNum := ssh.QuickShell()
    if channelNum < 0 {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        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 {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        return
    }

    // Show what we received so far:
    fmt.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 {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        return
    }

    // Show what we received...
    fmt.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 {
        fmt.Println(ssh.LastErrorText())
        ssh.DisposeSsh()
        return
    }

    // Show what we received...
    fmt.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.
    saMatch := chilkat.NewStringArray()
    // 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--")

    sbReceived := chilkat.NewStringBuilder()
    moreComing := true
    for (moreComing == true) {

        success = ssh.ChannelReceiveUntilMatchN(channelNum,saMatch,"utf-8",true)
        if success != true {
            fmt.Println(ssh.LastErrorText())
            ssh.DisposeSsh()
            saMatch.DisposeStringArray()
            sbReceived.DisposeStringBuilder()
            return
        }

        moreComing = false

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

        fmt.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()

    ssh.DisposeSsh()
    saMatch.DisposeStringArray()
    sbReceived.DisposeStringBuilder()