Connect to FTP Through a SOCKS Proxy

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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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bool success = false;

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "myFtpLogin";

//  SocksVersion selects the proxy: 0 (default) = none, 4 = SOCKS4, 5 = SOCKS5.
ftp.SocksVersion = 5;
ftp.SocksHostname = "socks.example.com";
ftp.SocksPort = 1080;

//  SOCKS5 supports username/password authentication; SOCKS4 uses only a user identifier.
ftp.SocksUsername = "myProxyLogin";
ftp.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.Password = "myPassword";

success = ftp.Connect();
if (success == false) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

Debug.WriteLine("Connected through the SOCKS proxy.");

success = ftp.Disconnect();
if (success == false) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}