PHP

SMTP over Multiple Hop SSH

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

Application => ServerSSH1 => ServerSSH2 => SmtpServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

Chilkat2 PHP

<?php

use Chilkat2\Email;
use Chilkat2\MailMan;
use Chilkat2\Ssh;

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

$ssh1 = new Ssh();

// Connect directly to the 1st SSH server.
try {
    $ssh1->Connect('serverssh1.com', 22);

    // Authenticate using login/password:
    $ssh1->AuthenticatePw('ssh1Login', 'ssh1Password');

    // 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.
    $ssh2 = new Ssh();
    $ssh2->ConnectThroughSsh($ssh1, 'serverssh2.com', 22);

    // Authenticate with ssh2...
    $ssh2->AuthenticatePw('ssh2Login', 'ssh2Password');

    $mailman = new MailMan();

    // Tell the mailman object to connect to the SMTP server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => SMTPServer
    $mailman->UseSsh($ssh2);

    // Set the SMTP server.
    $mailman->SmtpHost = 'smtp.someserver.com';

    // Set the SMTP login/password (if required)
    $mailman->SmtpUsername = 'myUsername';
    $mailman->SmtpPassword = 'myPassword';

    // Create a new email object
    $email = new Email();

    $email->Subject = 'This is a test';
    $email->Body = 'This is a test';
    $email->From = 'Chilkat Support <support@chilkatsoft.com>';
    $email->AddTo('Chilkat Admin', 'admin@chilkatsoft.com');

    $mailman->SendEmail($email);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Close the connection with the server.  This closes the tunnel through ssh2.
try {
    $mailman->CloseSmtpConnection();
} catch (\Chilkat2\Exception $e) {
    echo "Connection to SMTP server not closed cleanly.\n";
}

echo "Mail Sent!\n";

// 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();