(Node.js) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

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 = "192.168.1.108";
    var port = 22;

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

    // Wait a max of 15 seconds when reading responses..
    ssh1.IdleTimeoutMs = 15000;

    // 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.
    // Note: Any number of SSH connections may be simultaneously tunneled through a single
    // existing SSH connection.
    var ssh2 = new chilkat.Ssh();
    success = ssh2.ConnectThroughSsh(ssh1,"someremoteserver.com",22);
    if (success !== true) {
        console.log(ssh2.LastErrorText);
        return;
    }

    ssh2.IdleTimeoutMs = 15000;

    // Authenticate with ssh2...
    success = ssh2.AuthenticatePw("myLogin2","myPassword2");
    if (success !== true) {
        console.log(ssh2.LastErrorText);
        return;
    }

    // The application may now is connected and authenticated with ssh2.
    // The application can do whatever it desires just as if it was directly
    // connected to ssh2.   For example, the application might open
    // a session channel to send commands or start a remote shell..
    var channelNum = ssh2.OpenSessionChannel();
    if (channelNum < 0) {
        console.log(ssh2.LastErrorText);
        return;
    }

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

    // Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
    // The connection with ssh1 is still alive, and may be used for more connections.
    ssh2.Disconnect();

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

    ssh1.Disconnect();

}

chilkatExample();