Rust

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.

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Rust


let ftp = chilkat::Ftp2::new();

ftp.set_hostname("ftp.example.com");
ftp.set_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.set_password("myPassword");

// Ssl = true 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.set_ssl(true);
ftp.set_port(990);

// AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
// FTPS) for modern servers instead.  Left false here.
ftp.set_auth_ssl(false);

// AutoFix (default true) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
// (21 or 990).  Disable it when setting these properties explicitly, as here.
ftp.set_auto_fix(false);

if ftp.connect().is_err() {
    println!("{}", ftp.last_error_text());
    return;
}

println!("Connected using implicit FTPS.");

if ftp.disconnect().is_err() {
    println!("{}", ftp.last_error_text());
    return;
}