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.

Chilkat Perl Downloads

Download Chilkat for Perl

Perl

use chilkat();

$success = 0;

$ftp = chilkat::CkFtp2->new();

$ftp->put_Hostname("ftp.example.com");
$ftp->put_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->put_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->put_Ssl(1);
$ftp->put_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->put_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->put_AutoFix(0);

$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

print "Connected using implicit FTPS." . "\r\n";

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}