Perl

SSH Tunnel Uncommon Options

Demonstrates the UncommonOptions property, which enables optional behavior for uncommon requirements. The default is an empty string; provide a comma-separated list of keywords to enable more than one option. Available keywords are listed in the reference documentation.

Background: This is a catch-all for narrow workarounds that do not warrant their own properties — forcing a specific signature algorithm, disabling the periodic keep-alive, removing weak MACs, bypassing a VPN on Android, and so on. Most applications never set it. When you do, it is usually to satisfy a particular server's quirk or a specific security requirement, and the exact keyword matters, so consult the documented list rather than guessing.

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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the SshTunnel.UncommonOptions property, which enables optional behavior for
# uncommon requirements.  The default is an empty string, appropriate for most applications.
# Provide a comma-separated list of keywords to enable more than one option.

my $tunnel = Chilkat2::SshTunnel->new;

# For example, disable the periodic keep-alive ignore message and remove weak MAC algorithms
# from those offered.  Available keywords are listed in the reference documentation.
$tunnel->UncommonOptions('NoKeepAliveIgnoreMsg,no-weak-mac-algs');

$tunnel->DestHostname('db.internal.example.com');
$tunnel->DestPort(5432);

my $sshPort = 22;
my $success = $tunnel->Connect('ssh.example.com', $sshPort);
if (!$success) {
    print $tunnel->LastErrorText, "\n";
    exit;
}

# Normally you would not hard-code the password in source.  You should instead obtain it
# from an interactive prompt, environment variable, or a secrets vault.
my $password = 'mySshPassword';

$success = $tunnel->AuthenticatePw('mySshLogin', $password);
if (!$success) {
    print $tunnel->LastErrorText, "\n";
    exit;
}

my $listenPort = 1080;
$success = $tunnel->BeginAccepting($listenPort);
if (!$success) {
    print $tunnel->LastErrorText, "\n";
    exit;
}

print "Tunnel established.\n";

my $waitForThreadExit = 1;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if (!$success) {
    print $tunnel->LastErrorText, "\n";
    exit;
}