PHP

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

use Chilkat2\Ftp2;

// 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 Ftp2();

$ftp->Hostname = 'ftp.example.com';
$ftp->Port = 21;

// Connect in clear text first (Ssl is false).
try {
    $ftp->ConnectOnly();

    // Upgrade the control channel to explicit TLS (AUTH TLS).
    $ftp->ConvertToTls();

    // Now authenticate over the encrypted control channel.
    $ftp->Username = 'myFtpLogin';
    $ftp->Password = 'myPassword';
    $ftp->LoginAfterConnectOnly();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

try {
    $ftp->Disconnect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}