Node.js

SSH Tunnel Per-Client Logging and Client Identifier

Demonstrates the ClientLogDir and ClientIdentifier properties. When ClientLogDir is set, a separate log file is created for each tunnel client; ClientIdentifier is the SSH client-identification string sent during the handshake.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: When many clients share one tunnel, a single combined log is hard to follow, so ClientLogDir gives each connection its own file — the fastest way to diagnose one misbehaving client. ClientIdentifier sets the version string the server sees; overriding the default is occasionally needed for compatibility with servers that key behavior off the client identification, or simply to label your application in server logs.

Chilkat Node.js Downloads

Download Chilkat for Node.js

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  Demonstrates the SshTunnel per-client logging properties ClientLogDir and ClientIdentifier.

    var tunnel = new chilkat.SshTunnel();

    //  When ClientLogDir is set, a separate log file is created for each tunnel client in this
    //  directory, which is useful for troubleshooting individual connections.
    tunnel.ClientLogDir = "qa_output/client_logs";

    //  The SSH client-identification string sent to the SSH server during the handshake.
    tunnel.ClientIdentifier = "SSH-2.0-MyTunnelApp_1.0";

    tunnel.DestHostname = "db.internal.example.com";
    tunnel.DestPort = 5432;

    var sshPort = 22;
    success = tunnel.Connect("ssh.example.com",sshPort);
    if (success == false) {
        console.log(tunnel.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 = tunnel.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        console.log(tunnel.LastErrorText);
        return;
    }

    var listenPort = 1080;
    success = tunnel.BeginAccepting(listenPort);
    if (success == false) {
        console.log(tunnel.LastErrorText);
        return;
    }

    console.log("Tunnel running; each client is logged in " + tunnel.ClientLogDir);

    var waitForThreadExit = true;
    success = tunnel.CloseTunnel(waitForThreadExit);
    if (success == false) {
        console.log(tunnel.LastErrorText);
        return;
    }


}

chilkatExample();