Rust

SSH Tunnel Uncommon Options

Demonstrates the UncommonOptions property, which enables optional behavior for uncommon requirements. The default is an empty string; provide a comma-separated list of keywords to enable more than one option. Available keywords are listed in the reference documentation.

Background: This is a catch-all for narrow workarounds that do not warrant their own properties — forcing a specific signature algorithm, disabling the periodic keep-alive, removing weak MACs, bypassing a VPN on Android, and so on. Most applications never set it. When you do, it is usually to satisfy a particular server's quirk or a specific security requirement, and the exact keyword matters, so consult the documented list rather than guessing.

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Rust


// Demonstrates the SshTunnel.UncommonOptions property, which enables optional behavior for
// uncommon requirements.  The default is an empty string, appropriate for most applications.
// Provide a comma-separated list of keywords to enable more than one option.

let tunnel = chilkat::SshTunnel::new();

// For example, disable the periodic keep-alive ignore message and remove weak MAC algorithms
// from those offered.  Available keywords are listed in the reference documentation.
tunnel.set_uncommon_options("NoKeepAliveIgnoreMsg,no-weak-mac-algs");

tunnel.set_dest_hostname("db.internal.example.com");
tunnel.set_dest_port(5432);

let ssh_port = 22;
if tunnel.connect("ssh.example.com", ssh_port).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// 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.
let password = "mySshPassword".to_string();

if tunnel.authenticate_pw("mySshLogin", &password).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

let listen_port = 1080;
if tunnel.begin_accepting(listen_port).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

println!("Tunnel established.");

let wait_for_thread_exit = true;
if tunnel.close_tunnel(wait_for_thread_exit).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}