Perl

FTP over Implicit TLS (Ssl, AuthSsl, AutoFix)

Demonstrates the SSL/TLS connection-mode properties Ssl, AuthSsl, and AutoFix. Setting Ssl true selects implicit FTPS, in which TLS begins immediately after the TCP connection on port 990.

Background: FTP has two ways to add TLS: implicit (this example) starts encrypted from the first byte on a dedicated port, 990; explicit (via AuthTls) connects in the clear on port 21 and issues AUTH TLS to upgrade. Explicit is the modern standard; implicit persists mainly for legacy servers. AuthSsl is an obsolete AUTH SSL variant to avoid. AutoFix, on by default, infers the mode from the port — disable it when you set these properties explicitly so it does not override your choice.

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use strict;
use warnings;
use Chilkat2;

my $ftp = Chilkat2::Ftp2->new;

$ftp->Hostname('ftp.example.com');
$ftp->Username('myFtpLogin');

# 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.
$ftp->Password('myPassword');

# Ssl = 1 selects IMPLICIT FTPS: TLS begins immediately after the TCP connection, before
# the greeting.  Port 990 is conventional for implicit FTPS.  Ssl takes priority over AuthTls
# and AuthSsl.
$ftp->Ssl(1);
$ftp->Port(990);

# AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
# FTPS) for modern servers instead.  Left 0 here.
$ftp->AuthSsl(0);

# AutoFix (default 1) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
# (21 or 990).  Disable it when setting these properties explicitly, as here.
$ftp->AutoFix(0);

my $success = $ftp->Connect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}

print "Connected using implicit FTPS.\n";

$success = $ftp->Disconnect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}