Perl Requires Chilkat v9.5.0.55+

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 used to accomplish this task.

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 SMTP server though the ssh2 tunnel (which itself is routed through ssh1).
# The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => SMTPServer
$success = $mailman->UseSsh($ssh2);
if (!$success) {
    print $mailman->LastErrorText, "\n";
    exit;
}

# 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
my $email = Chilkat2::Email->new;

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

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

# Close the connection with the server.  This closes the tunnel through ssh2.
$success = $mailman->CloseSmtpConnection();
if (!$success) {
    print "Connection to SMTP server not closed cleanly.\n";
}

print "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();