Rust

SSH Tunnel Per-Client Logging and Client Identifier

Demonstrates the ClientLogDir and ClientIdentifier properties. When ClientLogDir is set, a separate log file is created for each tunnel client; ClientIdentifier is the SSH client-identification string sent during the handshake.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: When many clients share one tunnel, a single combined log is hard to follow, so ClientLogDir gives each connection its own file — the fastest way to diagnose one misbehaving client. ClientIdentifier sets the version string the server sees; overriding the default is occasionally needed for compatibility with servers that key behavior off the client identification, or simply to label your application in server logs.

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Rust


// Demonstrates the SshTunnel per-client logging properties ClientLogDir and ClientIdentifier.

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

// When ClientLogDir is set, a separate log file is created for each tunnel client in this
// directory, which is useful for troubleshooting individual connections.
tunnel.set_client_log_dir("qa_output/client_logs");

// The SSH client-identification string sent to the SSH server during the handshake.
tunnel.set_client_identifier("SSH-2.0-MyTunnelApp_1.0");

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 running; each client is logged in {}", tunnel.client_log_dir());

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