Perl 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 Perl

use strict;
use warnings;
use Chilkat2;

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

my $ssh1 = Chilkat2::Ssh->new;

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

# Authenticate using login/password:
$success = $ssh1->AuthenticatePw('ssh1Login', 'ssh1Password');
if (!$success) {
    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.
my $ssh2 = Chilkat2::Ssh->new;
$success = $ssh2->ConnectThroughSsh($ssh1, 'serverssh2.com', 22);
if (!$success) {
    print $ssh2->LastErrorText, "\n";
    exit;
}

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

my $mailman = Chilkat2::MailMan->new;

# 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) {
    print $mailman->LastErrorText, "\n";
    exit;
}

# 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.
$success = $mailman->Pop3BeginSession();
if (!$success) {
    print $mailman->LastErrorText, "\n";
    exit;
}

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

my $email = Chilkat2::Email->new;
my $i = 1;
while ($i <= $numMessages) {
    # Fetch by the message number (not by the UIDL)
    $success = $mailman->FetchOne(0, 0, $i, $email);
    if (!$success) {
        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();