501 lines
23 KiB
Rust
501 lines
23 KiB
Rust
mod session;
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pub mod protocol;
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use std::{collections::HashMap, net::{IpAddr, SocketAddr}, io, sync::{Mutex, RwLock, Arc}};
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use tokio::{net::{TcpListener, TcpStream}, sync::{mpsc, mpsc::Sender}};
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use libmdns::Service;
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use strum_macros::Display;
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use session::Session;
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use ed25519_dalek::PUBLIC_KEY_LENGTH;
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use uuid::Uuid;
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use crate::{constants, discovery, identity::{Contact, Identity}, print_error};
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use crate::ui_interface::UiConnection;
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#[derive(Display, Debug, PartialEq, Eq)]
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pub enum SessionError {
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ConnectionReset,
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BrokenPipe,
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TransmissionCorrupted,
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BufferTooLarge,
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InvalidSessionId,
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Unknown
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}
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enum SessionCommand {
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Send {
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buff: Vec<u8>
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},
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Close,
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}
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pub struct SessionManager {
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session_counter: RwLock<usize>,
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sessions: RwLock<HashMap<usize, (bool ,[u8; PUBLIC_KEY_LENGTH], mpsc::Sender<SessionCommand>)>>,
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identity: RwLock<Option<Identity>>,
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ui_connection: Mutex<Option<UiConnection>>,
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loaded_contacts: RwLock<HashMap<usize, Contact>>,
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pub last_loaded_msg_offsets: RwLock<HashMap<usize, usize>>,
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pub saved_msgs: Mutex<HashMap<usize, Vec<(bool, Vec<u8>)>>>,
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not_seen: RwLock<Vec<usize>>,
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mdns_service: Mutex<Option<Service>>,
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listener_stop_signal: Mutex<Option<Sender<()>>>,
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}
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impl SessionManager {
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fn with_ui_connection<F>(&self, f: F) where F: Fn(&mut UiConnection) {
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let mut ui_connection_opt = self.ui_connection.lock().unwrap();
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match ui_connection_opt.as_mut() {
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Some(ui_connection) => if ui_connection.is_valid {
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f(ui_connection);
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}
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None => {}
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}
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}
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pub async fn connect_to(session_manager: Arc<SessionManager>, ip: IpAddr) -> io::Result<()> {
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let stream = TcpStream::connect(SocketAddr::new(ip, constants::PORT)).await?;
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SessionManager::handle_new_session(session_manager, Session::new(stream), true);
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Ok(())
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}
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pub fn store_msg(&self, session_id: &usize, outgoing: bool, buffer: Vec<u8>) {
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let mut msg_saved = false;
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if self.is_contact(session_id) {
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match self.identity.read().unwrap().as_ref().unwrap().store_msg(&self.loaded_contacts.read().unwrap().get(session_id).unwrap().uuid, outgoing, &buffer) {
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Ok(_) => {
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msg_saved = true;
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*self.last_loaded_msg_offsets.write().unwrap().get_mut(session_id).unwrap() += 1;
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},
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Err(e) => print_error!(e),
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}
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}
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if !msg_saved {
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self.saved_msgs.lock().unwrap().get_mut(&session_id).unwrap().push((false, buffer));
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}
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}
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pub async fn send_to(&self, session_id: &usize, message: Vec<u8>) -> Result<(), SessionError> {
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let sender = {
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let mut sessions = self.sessions.write().unwrap();
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match sessions.get_mut(session_id) {
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Some(session_data) => session_data.2.clone(),
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None => return Err(SessionError::InvalidSessionId)
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}
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};
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match sender.send(SessionCommand::Send {
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buff: message
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}).await {
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Ok(_) => Ok(()),
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Err(e) => {
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print_error!(e);
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Err(SessionError::BrokenPipe)
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}
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}
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}
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fn remove_session(&self, session_id: &usize) {
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self.sessions.write().unwrap().remove(session_id);
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self.saved_msgs.lock().unwrap().remove(session_id);
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self.not_seen.write().unwrap().retain(|x| x != session_id);
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}
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fn handle_new_session(session_manager: Arc<SessionManager>, mut session: Session, outgoing: bool) {
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tokio::spawn(async move {
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let mut peer_public_key = [0; PUBLIC_KEY_LENGTH];
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let session = {
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let identity = {
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let identity_opt = session_manager.identity.read().unwrap();
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match identity_opt.as_ref() {
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Some(identity) => Some(identity.clone()),
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None => None
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}
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};
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match identity {
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Some(identity) => {
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match session.do_handshake(&identity).await {
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Ok(_) => {
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peer_public_key = session.peer_public_key.unwrap();
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if identity.get_public_key() != peer_public_key {
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Some(session)
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} else {
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None
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}
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}
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Err(e) => {
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print_error!(e);
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None
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}
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}
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}
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None => None
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}
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};
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if let Some(mut session) = session {
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let mut is_contact = false;
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let session_data = {
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let mut sessions = session_manager.sessions.write().unwrap();
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let mut is_new_session = true;
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for (_, registered_session) in sessions.iter() {
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if registered_session.1 == peer_public_key { //already connected to this identity
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is_new_session = false;
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break;
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}
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}
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if is_new_session && session_manager.is_identity_loaded() { //check if we didn't logged out during the handshake
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let (sender, receiver) = mpsc::channel(32);
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let mut session_id = None;
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for (i, contact) in session_manager.loaded_contacts.read().unwrap().iter() {
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if contact.public_key == peer_public_key { //session is a known contact. Assign the contact session_id to it
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sessions.insert(*i, (outgoing, peer_public_key, sender.clone()));
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is_contact = true;
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session_id = Some(*i);
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break;
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}
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}
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if session_id.is_none() { //if not a contact, increment the session_counter
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let mut session_counter = session_manager.session_counter.write().unwrap();
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sessions.insert(*session_counter, (outgoing, peer_public_key, sender));
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session_id = Some(*session_counter);
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*session_counter += 1;
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}
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let session_id = session_id.unwrap();
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session_manager.saved_msgs.lock().unwrap().insert(session_id, Vec::new());
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Some((session_id, receiver))
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} else {
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None
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}
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};
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if let Some(session_data) = session_data {
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let (session_id, mut receiver) = session_data;
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session_manager.with_ui_connection(|ui_connection| {
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ui_connection.on_new_session(session_id, outgoing);
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});
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if !is_contact {
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match session.encrypt_and_send(&protocol::ask_name()).await {
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Ok(_) => {}
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Err(e) => {
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print_error!(e);
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session_manager.remove_session(&session_id);
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return;
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}
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}
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}
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loop {
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tokio::select! {
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buffer = session.receive_and_decrypt() => {
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match buffer {
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Ok(buffer) => {
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if buffer[0] == protocol::Headers::ASK_NAME {
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let name = {
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session_manager.identity.read().unwrap().as_ref().and_then(|identity| Some(identity.name.clone()))
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};
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if name.is_some() { //can be None if we log out just before locking the identity mutex
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match session.encrypt_and_send(&protocol::tell_name(&name.unwrap())).await {
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Ok(_) => {}
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Err(e) => {
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print_error!(e);
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session.close();
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break;
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}
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}
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}
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} else {
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let buffer = if buffer[0] == protocol::Headers::FILE {
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let file_name_len = u16::from_be_bytes([buffer[1], buffer[2]]) as usize;
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let file_name = &buffer[3..3+file_name_len];
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match session_manager.store_file(&session_id, &buffer[3+file_name_len..]) {
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Ok(file_uuid) => {
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Some([&[protocol::Headers::FILE][..], file_uuid.as_bytes(), file_name].concat())
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}
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Err(e) => {
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print_error!(e);
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None
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}
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}
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} else {
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Some(buffer)
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};
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if buffer.is_some() {
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if buffer.as_ref().unwrap()[0] != protocol::Headers::TELL_NAME {
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session_manager.set_seen(session_id, false);
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}
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session_manager.with_ui_connection(|ui_connection| {
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ui_connection.on_received(&session_id, buffer.as_ref().unwrap());
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});
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if session_manager.is_contact(&session_id) {
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if buffer.as_ref().unwrap()[0] == protocol::Headers::TELL_NAME {
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match std::str::from_utf8(&buffer.as_ref().unwrap()[1..]) {
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Ok(new_name) => {
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let mut loaded_contacts = session_manager.loaded_contacts.write().unwrap();
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let contact = loaded_contacts.get_mut(&session_id).unwrap();
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contact.name = new_name.to_string();
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match session_manager.identity.read().unwrap().as_ref().unwrap().change_contact_name(&contact.uuid, new_name) {
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Ok(_) => {}
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Err(e) => print_error!(e)
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}
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}
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Err(e) => print_error!(e)
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}
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}
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}
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session_manager.store_msg(&session_id, false, buffer.unwrap());
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}
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}
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}
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Err(e) => {
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if e != SessionError::BrokenPipe && e != SessionError::ConnectionReset {
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print_error!(e);
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}
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session_manager.with_ui_connection(|ui_connection| {
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ui_connection.on_disconnected(session_id);
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});
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break;
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}
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}
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}
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command = receiver.recv() => {
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match command.unwrap() {
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SessionCommand::Send { buff } => {
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match session.encrypt_and_send(&buff).await {
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Ok(_) => session_manager.with_ui_connection(|ui_connection| {
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ui_connection.on_msg_sent(session_id, &buff);
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}),
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Err(e) => print_error!(e)
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}
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}
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SessionCommand::Close => {
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session.close();
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break;
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}
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}
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}
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else => {
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println!("{} dead", session_id);
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break;
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}
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}
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}
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session_manager.remove_session(&session_id);
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}
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}
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});
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}
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pub async fn start_listener(session_manager: Arc<SessionManager>) -> io::Result<()> {
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let server_v6 = TcpListener::bind(SocketAddr::new("::1".parse().unwrap(), constants::PORT)).await?;
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let server_v4 = TcpListener::bind(SocketAddr::new("0.0.0.0".parse().unwrap(), constants::PORT)).await?;
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let (sender, mut receiver) = mpsc::channel(1);
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*session_manager.listener_stop_signal.lock().unwrap() = Some(sender);
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*session_manager.mdns_service.lock().unwrap() = Some(discovery::advertise_me());
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tokio::spawn(async move {
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loop {
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let (stream, _addr) = (tokio::select! {
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client = server_v6.accept() => client,
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client = server_v4.accept() => client,
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_ = receiver.recv() => break
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}).unwrap();
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SessionManager::handle_new_session(session_manager.clone(), Session::new(stream), false);
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}
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});
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Ok(())
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}
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pub fn list_sessions(&self) -> Vec<(usize, bool)> {
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let sessions = self.sessions.read().unwrap();
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sessions.iter().map(|t| (*t.0, t.1.0)).collect()
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}
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pub fn list_contacts(&self) -> Vec<(usize, String, bool)> {
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self.loaded_contacts.read().unwrap().iter().map(|c| (*c.0, c.1.name.clone(), c.1.verified)).collect()
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}
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pub fn get_saved_msgs(&self) -> HashMap<usize, Vec<(bool, Vec<u8>)>> {
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self.saved_msgs.lock().unwrap().clone()
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}
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pub fn get_peer_public_key(&self, session_id: &usize) -> Option<[u8; PUBLIC_KEY_LENGTH]> {
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let sessions = self.sessions.read().unwrap();
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let session = sessions.get(session_id)?;
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Some(session.1)
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}
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pub fn list_not_seen(&self) -> Vec<usize> {
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self.not_seen.read().unwrap().clone()
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}
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pub fn set_seen(&self, session_id: usize, seen: bool) {
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let mut not_seen = self.not_seen.write().unwrap();
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if seen {
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not_seen.retain(|i| i != &session_id)
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} else if !not_seen.contains(&session_id) {
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not_seen.push(session_id);
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}
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let mut loaded_contacts = self.loaded_contacts.write().unwrap();
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match loaded_contacts.get_mut(&session_id) {
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Some(contact) => {
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if contact.seen != seen {
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match self.identity.read().unwrap().as_ref().unwrap().set_contact_seen(&contact.uuid, seen) {
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Ok(_) => contact.seen = seen,
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Err(e) => print_error!(e)
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}
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}
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}
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None => {}
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}
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}
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pub fn add_contact(&self, session_id: usize, name: String) -> Result<(), rusqlite::Error> {
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let contact = self.identity.read().unwrap().as_ref().unwrap().add_contact(name, self.get_peer_public_key(&session_id).unwrap())?;
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self.loaded_contacts.write().unwrap().insert(session_id, contact);
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self.last_loaded_msg_offsets.write().unwrap().insert(session_id, 0);
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Ok(())
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}
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pub fn remove_contact(&self, session_id: &usize) -> Result<usize, rusqlite::Error> {
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let mut loaded_contacts = self.loaded_contacts.write().unwrap();
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let result = Identity::remove_contact(&loaded_contacts.get(session_id).unwrap().uuid);
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if result.is_ok() {
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loaded_contacts.remove(session_id);
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self.last_loaded_msg_offsets.write().unwrap().remove(session_id);
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}
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result
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}
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pub fn set_verified(&self, session_id: &usize) -> Result<usize, rusqlite::Error> {
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let mut loaded_contacts = self.loaded_contacts.write().unwrap();
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let contact = loaded_contacts.get_mut(session_id).unwrap();
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let result = self.identity.read().unwrap().as_ref().unwrap().set_verified(&contact.uuid);
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if result.is_ok() {
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contact.verified = true;
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}
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result
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}
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pub fn delete_conversation(&self, session_id: usize) -> Result<usize, rusqlite::Error> {
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let result = Identity::delete_conversation(&self.loaded_contacts.read().unwrap().get(&session_id).unwrap().uuid);
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if result.is_ok() {
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self.last_loaded_msg_offsets.write().unwrap().insert(session_id, 0);
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self.saved_msgs.lock().unwrap().insert(session_id, Vec::new());
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}
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result
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}
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pub fn is_contact(&self, session_id: &usize) -> bool {
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self.loaded_contacts.read().unwrap().contains_key(session_id)
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}
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pub fn load_file(&self, uuid: Uuid) -> Option<Vec<u8>> {
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self.identity.read().unwrap().as_ref().unwrap().load_file(uuid)
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}
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pub fn store_file(&self, session_id: &usize, data: &[u8]) -> Result<Uuid, rusqlite::Error> {
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self.identity.read().unwrap().as_ref().unwrap().store_file(match self.loaded_contacts.read().unwrap().get(session_id) {
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Some(contact) => Some(contact.uuid),
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None => None
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}, data)
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}
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pub fn load_msgs(&self, session_id: &usize, count: usize) -> Option<Vec<(bool, Vec<u8>)>> {
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let mut offsets = self.last_loaded_msg_offsets.write().unwrap();
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let msgs = self.identity.read().unwrap().as_ref().unwrap().load_msgs(&self.loaded_contacts.read().unwrap().get(session_id).unwrap().uuid, *offsets.get(session_id).unwrap(), count);
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if msgs.is_some() {
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*offsets.get_mut(session_id).unwrap() += msgs.as_ref().unwrap().len();
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}
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msgs
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}
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pub fn get_public_keys(&self, session_id: &usize) -> ([u8; PUBLIC_KEY_LENGTH], [u8; PUBLIC_KEY_LENGTH]) {
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(self.identity.read().unwrap().as_ref().unwrap().get_public_key(), self.loaded_contacts.read().unwrap().get(session_id).unwrap().public_key)
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}
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pub fn get_my_name(&self) -> String {
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self.identity.read().unwrap().as_ref().unwrap().name.clone()
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}
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#[allow(unused_must_use)]
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pub async fn change_name(&self, new_name: String) -> Result<usize, rusqlite::Error> {
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let telling_name = protocol::tell_name(&new_name);
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let result = self.identity.write().unwrap().as_mut().unwrap().change_name(new_name);
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if result.is_ok() {
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let senders: Vec<Sender<SessionCommand>> = {
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self.sessions.read().unwrap().iter().map(|i| i.1.2.clone()).collect()
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};
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for sender in senders.into_iter() {
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sender.send(SessionCommand::Send {
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buff: telling_name.clone()
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}).await;
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}
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}
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result
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}
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#[allow(unused_must_use)]
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pub async fn stop(&self) {
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*self.mdns_service.lock().unwrap() = None; //unregister mdns service
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let mut sender = self.listener_stop_signal.lock().unwrap();
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if sender.is_some() {
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sender.as_ref().unwrap().send(()).await;
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*sender = None;
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}
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self.set_identity(None);
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for (_, _, sender) in self.sessions.read().unwrap().values() {
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sender.send(SessionCommand::Close).await;
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}
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*self.ui_connection.lock().unwrap() = None;
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*self.session_counter.write().unwrap() = 0;
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self.loaded_contacts.write().unwrap().clear();
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self.saved_msgs.lock().unwrap().clear();
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}
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pub fn is_identity_loaded(&self) -> bool {
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self.identity.read().unwrap().is_some()
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}
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#[allow(unused_must_use)]
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pub fn set_identity(&self, identity: Option<Identity>) {
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let mut identity_guard = self.identity.write().unwrap();
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if identity.is_none() { //logout
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identity_guard.as_mut().unwrap().zeroize();
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}
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*identity_guard = identity;
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if identity_guard.is_some() { //login
|
|
match identity_guard.as_ref().unwrap().load_contacts() {
|
|
Some(contacts) => {
|
|
let mut loaded_contacts = self.loaded_contacts.write().unwrap();
|
|
let mut session_counter = self.session_counter.write().unwrap();
|
|
let mut not_seen = self.not_seen.write().unwrap();
|
|
contacts.into_iter().for_each(|contact| {
|
|
if !contact.seen {
|
|
not_seen.push(*session_counter);
|
|
}
|
|
loaded_contacts.insert(*session_counter, contact);
|
|
*session_counter += 1;
|
|
})
|
|
}
|
|
None => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn set_ui_connection(&self, ui_connection: UiConnection){
|
|
*self.ui_connection.lock().unwrap() = Some(ui_connection);
|
|
}
|
|
|
|
pub fn new() -> SessionManager {
|
|
SessionManager {
|
|
session_counter: RwLock::new(0),
|
|
sessions: RwLock::new(HashMap::new()),
|
|
identity: RwLock::new(None),
|
|
ui_connection: Mutex::new(None),
|
|
loaded_contacts: RwLock::new(HashMap::new()),
|
|
last_loaded_msg_offsets: RwLock::new(HashMap::new()),
|
|
saved_msgs: Mutex::new(HashMap::new()),
|
|
not_seen: RwLock::new(Vec::new()),
|
|
mdns_service: Mutex::new(None),
|
|
listener_stop_signal: Mutex::new(None),
|
|
}
|
|
}
|
|
}
|