PHP Extension

Upgrade an FTP Control Channel to TLS (ConvertToTls)

Demonstrates the Chilkat Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control channel to explicit TLS. It takes no arguments and is used with a manually staged connection created by ConnectOnly while Ssl is disabled.

Background: This exposes the explicit-FTPS AUTH TLS upgrade as a discrete step for the rare case where you need to do something on the clear connection first — inspect the greeting, apply a workaround — before securing it. In the normal case you simply set AuthTls and let Connect perform the upgrade automatically; this manual path exists for staged control.

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PHP Extension

<?php

include("chilkat.php");

$success = false;

//  Demonstrates the Ftp2.ConvertToTls method, which upgrades an already-connected clear FTP control
//  channel to explicit TLS.  It takes no arguments.  It is used with a manually staged connection
//  created by ConnectOnly while Ssl is disabled.

$ftp = new CkFtp2();

$ftp->put_Hostname('ftp.example.com');
$ftp->put_Port(21);

//  Connect in clear text first (Ssl is false).
$success = $ftp->ConnectOnly();
if ($success == false) {
    print $ftp->lastErrorText() . "\n";
    exit;
}

//  Upgrade the control channel to explicit TLS (AUTH TLS).
$success = $ftp->ConvertToTls();
if ($success == false) {
    print $ftp->lastErrorText() . "\n";
    exit;
}

//  Now authenticate over the encrypted control channel.
$ftp->put_Username('myFtpLogin');
$ftp->put_Password('myPassword');
$success = $ftp->LoginAfterConnectOnly();
if ($success == false) {
    print $ftp->lastErrorText() . "\n";
    exit;
}

print 'Control channel upgraded to TLS and logged in.' . "\n";

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


?>