PHP Extension

Connect to FTP Through a SOCKS Proxy

Demonstrates connecting through a SOCKS proxy using SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword.

Background: SOCKS is a general-purpose TCP relay, so it carries FTP transparently. SocksVersion is the switch — 0 disables it, while 4 or 5 selects the protocol. SOCKS5 supports username/password authentication and is the usual choice; SOCKS4 supports only a user identifier. Because FTP opens separate data connections, a SOCKS proxy combined with passive mode is generally the most reliable arrangement.

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PHP Extension

<?php

include("chilkat.php");

$success = false;

$ftp = new CkFtp2();

$ftp->put_Hostname('ftp.example.com');
$ftp->put_Username('myFtpLogin');

//  SocksVersion selects the proxy: 0 (default) = none, 4 = SOCKS4, 5 = SOCKS5.
$ftp->put_SocksVersion(5);
$ftp->put_SocksHostname('socks.example.com');
$ftp->put_SocksPort(1080);

//  SOCKS5 supports username/password authentication; SOCKS4 uses only a user identifier.
$ftp->put_SocksUsername('myProxyLogin');
$ftp->put_SocksPassword('myProxyPassword');

//  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');

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

print 'Connected through the SOCKS proxy.' . "\n";

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


?>