Node.js

Send an SSH IGNORE Message

Demonstrates the Chilkat Ssh.SendIgnore method, which sends an SSH IGNORE message. It takes no arguments. The server does not reply, but a successful send helps confirm the connection is still writable. No channel is required.

Background: The SSH IGNORE message is discarded by the peer by design; its usefulness is as a lightweight keep-alive or liveness probe. Because it exercises the actual write path, a successful SendIgnore is stronger evidence than CheckConnection that the link is still usable, without side effects on any channel.

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Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  Demonstrates the Ssh.SendIgnore method, which sends an SSH IGNORE message.  It takes no
    //  arguments.  The server does not reply, but a successful send helps confirm the connection is
    //  still writable.  No channel is required.

    var ssh = new chilkat.Ssh();

    //  Connect to the SSH server.  Port 22 is the usual SSH port.
    var sshPort = 22;
    success = ssh.Connect("ssh.example.com",sshPort);
    if (success == false) {
        console.log(ssh.LastErrorText);
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    var password = "mySshPassword";

    success = ssh.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        console.log(ssh.LastErrorText);
        return;
    }

    //  Send an IGNORE message to verify the connection is still writable.
    success = ssh.SendIgnore();
    if (success == false) {
        console.log(ssh.LastErrorText);
        return;
    }

    console.log("IGNORE message sent.");

    ssh.Disconnect();

}

chilkatExample();