fingerd: add basic mailbox parsing functionality

src/server/fingerd/remote_user_info.rs

@@ -0,0 +1,33 @@
+// /// Retrieve remote user information for the given username on the specified host.
+// ///
+// /// Returns None if the user does not exist or no information is available.
+// async fn get_remote_user(username: &str, host: &str) -> anyhow::Result<Option<RawFingerResponse>> {
+//     let addr = format!("{}:79", host);
+//     let socket_addrs: Vec<SocketAddr> = addr.to_socket_addrs()?.collect();
+
+//     if socket_addrs.is_empty() {
+//         return Err(anyhow::anyhow!(
+//             "Could not resolve address for host {}",
+//             host
+//         ));
+//     }
+
+//     let socket_addr = socket_addrs[0];
+
+//     let mut stream = TcpStream::connect(socket_addr).await?;
+
+//     let request = FingerRequest::new(false, username.to_string());
+//     let request_bytes = request.to_bytes();
+//     stream.write_all(&request_bytes).await?;
+
+//     let mut response_bytes = Vec::new();
+//     stream.read_to_end(&mut response_bytes).await?;
+
+//     let response = RawFingerResponse::from_bytes(&response_bytes);
+
+//     if response.is_empty() {
+//         Ok(None)
+//     } else {
+//         Ok(Some(response))
+//     }
+// }