Function get_protocol_info 

pub async fn get_protocol_info(
    socket: &mut ControlSocket,
) -> Result<ProtocolInfo, Error>

Queries Tor for protocol and authentication information.

Issues a PROTOCOLINFO 1 command to the control socket and parses the response. This must be called before authentication to determine which authentication methods are available.

Preconditions

• The socket must be connected but not yet authenticated
• No prior commands should have been sent on this connection

Postconditions

• On success: Returns protocol information including available auth methods
• On failure: The socket state is undefined; reconnection may be required

Arguments

• socket - A connected control socket

Errors

Returns an error if:

• Error::Socket: Connection failed or was closed
• Error::Protocol: Response was malformed or indicated failure

Example

use stem_rs::auth::get_protocol_info;
use stem_rs::ControlSocket;

let mut socket = ControlSocket::connect_port("127.0.0.1:9051".parse()?).await?;
let info = get_protocol_info(&mut socket).await?;

println!("Connected to Tor {}", info.tor_version);
for method in &info.auth_methods {
    println!("  Auth method: {:?}", method);
}

Protocol Details

The PROTOCOLINFO command returns a multi-line response:

250-PROTOCOLINFO 1
250-AUTH METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/path/to/cookie"
250-VERSION Tor="0.4.7.1"
250 OK