PHP Requires Chilkat v11.0.0+

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

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 POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
    $mailman->UseSsh($ssh2);

    // Set the POP3 server's hostname
    $mailman->MailHost = 'pop.example.com';

    // Set the POP3 login/password.
    $mailman->PopUsername = 'myLogin';
    $mailman->PopPassword = 'myPassword';

    // Establish the POP3 connection through the ssh2 tunnel.
    $mailman->Pop3BeginSession();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

$email = new Email();
$i = 1;
while ($i <= $numMessages) {
    // Fetch by the message number (not by the UIDL)
    try {
        $mailman->FetchOne(false, 0, $i, $email);
    } catch (\Chilkat2\Exception $e) {
        echo $e->getMessage(), "\n";
        exit;
    }

    echo $email->From, ': ', $email->Subject, "\n\n";

    $i = $i + 1;
}

// 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.
$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();