Chilkat Examples

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Node.js Examples


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(Node.js) POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

The ConnectThroughSsh and UseSsh methods are 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') {  
    var chilkat = require('chilkat_node10_win32'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('chilkat_node10_arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('chilkat_node10_linux32');
    } else {
        var chilkat = require('chilkat_node10_linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('chilkat_node10_macosx');
}

function chilkatExample() {

    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    var ssh1 = new chilkat.Ssh();

    //  Any string automatically begins a fully-functional 30-day trial.
    var success = ssh1.UnlockComponent("Anything for 30-day trial");
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    //  Connect directly to the 1st SSH server.
    success = ssh1.Connect("serverssh1.com",22);
    if (success !== true) {
        console.log(ssh1.LastErrorText);
        return;
    }

    //  Authenticate using login/password:
    success = ssh1.AuthenticatePw("ssh1Login","ssh1Password");
    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,"serverssh2.com",22);
    if (success !== true) {
        console.log(ssh2.LastErrorText);
        return;
    }

    //  Authenticate with ssh2...
    success = ssh2.AuthenticatePw("ssh2Login","ssh2Password");
    if (success !== true) {
        console.log(ssh2.LastErrorText);
        return;
    }

    var mailman = new chilkat.MailMan();

    //  Any string argument automatically begins the 30-day trial.
    success = mailman.UnlockComponent("30-day trial");
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    //  Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
    //  The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
    success = mailman.UseSsh(ssh2);
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    //  Set the POP3 server's hostname
    mailman.MailHost = "pop.someMailServer.com";

    //  Set the POP3 login/password.
    mailman.PopUsername = "myLogin";
    mailman.PopPassword = "myPassword";

    //  Establish the POP3 connection through the ssh2 tunnel.
    success = mailman.Pop3BeginSession();
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    //  Get the number of messages in the mailbox.
    var numMessages = mailman.GetMailboxCount();

    var i;
    if (numMessages > 0) {

        // email: Email
        var email;
        for (i = 1; i <= numMessages; i++) {

            email = mailman.FetchByMsgnum(i);
            if (email == null ) {
                console.log(mailman.LastErrorText);
                return;
            }
            else {
                console.log(email.From + ": " + email.Subject + "\n");

            }

        }

    }

    //  Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
    //  The connection with ssh2 is still alive, and may be used for more connections.
    success = mailman.Pop3EndSession();

    //  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();

 

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