(PHP ActiveX) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

$ssh1 = new COM("Chilkat_9_5_0.Ssh");

// Connect directly to the 1st SSH server.
$success = $ssh1->Connect('serverssh1.com',22);
if ($success != 1) {
    print $ssh1->LastErrorText . "\n";
    exit;
}

// Authenticate using login/password:
$success = $ssh1->AuthenticatePw('ssh1Login','ssh1Password');
if ($success != 1) {
    print $ssh1->LastErrorText . "\n";
    exit;
}

// 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 COM("Chilkat_9_5_0.Ssh");
$success = $ssh2->ConnectThroughSsh($ssh1,'serverssh2.com',22);
if ($success != 1) {
    print $ssh2->LastErrorText . "\n";
    exit;
}

// Authenticate with ssh2...
$success = $ssh2->AuthenticatePw('ssh2Login','ssh2Password');
if ($success != 1) {
    print $ssh2->LastErrorText . "\n";
    exit;
}

$mailman = new COM("Chilkat_9_5_0.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
$success = $mailman->UseSsh($ssh2);
if ($success != 1) {
    print $mailman->LastErrorText . "\n";
    exit;
}

// 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 != 1) {
    print $mailman->LastErrorText . "\n";
    exit;
}

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

$i = 0;

while ($i < $numMessages) {

    // email is a Chilkat_9_5_0.Email
    $email = $mailman->FetchByMsgnum($i);
    if ($mailman->LastMethodSuccess != 1) {
        print $mailman->LastErrorText . "\n";
        exit;
    }

    print $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.
$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();

?>