(Node.js) Multiple Hop SSH to SFTP

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var ssh1 = new chilkat.Ssh();

    // Hostname may be an IP address or domain name:
    var hostname = "192.168.1.111";
    var port = 22;

    // Connect directly to the 1st SSH server:
    var success = ssh1.Connect(hostname,port);
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw("myLogin","myPassword");
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    // Connect through the 1st SSH connection to reach a 2nd SSH server (for SFTP)
    // Note: Any number of connections may be simultaneously tunneled through a single
    // existing SSH connection.
    var sftp = new chilkat.SFtp();

    // Connect to some SSH/SFTP server through ssh1.
    success = sftp.ConnectThroughSsh(ssh1,"sftp.someremoteserver.com",22);
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // Authenticate with the SFTP server. 
    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // After authenticating, the SFTP subsystem must be initialized:
    success = sftp.InitializeSftp();
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    // Upload from the local file to the SSH server.
    // Important -- the remote filepath is the 1st argument,
    // the local filepath is the 2nd argument;
    var remoteFilePath = "hamlet.xml";
    var localFilePath = "c:/temp/hamlet.xml";

    success = sftp.UploadFileByName(remoteFilePath,localFilePath);
    if (success !== true) {
        console.log(sftp.LastErrorText);
        return;
    }

    console.log("Success.");

    // Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
    // The connection with ssh1 is still alive, and may be used for more connections.
    sftp.Disconnect();

    // ...
    // ...
    // ...

    ssh1.Disconnect();

}

chilkatExample();