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error::Error, + net::{Ipv4Addr}, +}; + +use clap::Parser; +use tokio::sync::mpsc; +use tokio::net::TcpListener; +use tokio::net::TcpStream; + + +mod node_setup; +mod peer; +mod peer_manager; + +use peer::Peer; +use peer_manager::PeerManager; + +#[derive(Parser)] +struct Cli { + #[arg(short = 'a', long = "tun-addr")] + tun_addr: Ipv4Addr, +} + +#[tokio::main] +async fn main() -> Result<(), Box> { + + let cli = Cli::parse(); + + // Create TUN interface and add static route + let node_tun = match node_setup::setup_node(cli.tun_addr).await { + Ok(tun)=> { + println!("Node setup complete"); + tun + }, + Err(e) => { + panic!("Error setting up node: {}", e); + } + }; + + // Create an unbounded channel for this node + let (to_tun, mut from_peers) = mpsc::unbounded_channel::>(); + + // Create the PeerManager: an interface to all peers this node is connected to + // Each node should include itself as a peer + // Additional static peers are obtained through the nodeconfig.toml file + let myself = Peer{id: "0".to_string(), to_peer: to_tun.clone()}; + let peer_manager = PeerManager::new(myself); + tokio::spawn(async move { + peer_manager.get_peers_from_config(to_tun.clone()).await; // --> here we create peer by TcpStream connect + + // listen for inbound request --> "to created the reverse peer object" --> here we reverse create peer be listener.accept'ing + tokio::spawn(async move { + match TcpListener::bind("[::]:9651").await { + Ok(listener) => { + // loop to accept the inbound requests + loop { + match listener.accept().await { + Ok((stream, _)) => { + println!("Got inbound request from: {}", stream.peer_addr().unwrap().to_string()); + // "reverse peer add" + let peer_id = stream.peer_addr().unwrap().to_string(); + match Peer::new(peer_id, to_tun.clone(), stream) { + Ok(new_peer) => { + let mut known_peers = peer_manager.known_peers.lock().unwrap(); + known_peers.push(new_peer); + }, + Err(e) => { + eprintln!("Error creating 'reverse' peer: {}", e); + } + } + }, + Err(e) => { + eprintln!("Error accepting TCP listener: {}", e); + } + } + } + }, + Err(e) => { + eprintln!("Error binding TCP listener: {}", e); + } + } + }) + }); + + // TODO: Loop to read the 'from_peers' receiver and foward it toward the TUN interface + + + // TODO: Loop to read from the TUN interface and forward it towards to correct destination peer (by selecting the correct to_peer sender) + + + + tokio::time::sleep(std::time::Duration::from_secs(60 * 60 * 24)).await; + Ok(()) +} \ No newline at end of file diff --git a/src/node_setup.rs b/src/node_setup.rs new file mode 100644 index 0000000..8cb70a9 --- /dev/null +++ b/src/node_setup.rs @@ -0,0 +1,84 @@ +use tokio_tun::{Tun, TunBuilder}; +use std::{ + sync::Arc, + net::Ipv4Addr, + error::Error, +}; +use rtnetlink::Handle; +use futures::stream::TryStreamExt; + +pub const TUN_NAME: &str = "tun0"; +pub const TUN_ROUTE_DEST: Ipv4Addr = Ipv4Addr::new(10, 0, 0, 0); +pub const TUN_ROUTE_PREFIX: u8 = 24; + +// Create a TUN interface +pub fn create_tun_interface(int_addr: Ipv4Addr) -> Result, Box> { + let tun = TunBuilder::new() + .name(TUN_NAME) + .tap(false) + .mtu(1420) + .packet_info(false) + .address(int_addr) + .broadcast(Ipv4Addr::new(255, 255, 255, 0)) + .up() + .try_build()?; + + Ok(Arc::new(tun)) +} + +// Add a route to the TUN interface +pub async fn add_route(handle: Handle) -> Result<(), Box> { + let mut link_request = handle + .link() + .get() + .match_name(String::from(TUN_NAME)) + .execute(); + + let link_idx = if let Some(link) = link_request.try_next().await? { + link.header.index + } else { + eprintln!("link not found"); + panic!("link not found"); + }; + + let route = handle.route(); + route + .add() + .v4() + .destination_prefix(TUN_ROUTE_DEST, TUN_ROUTE_PREFIX) + .output_interface(link_idx) + .execute() + .await?; + + Ok(()) +} + +pub async fn setup_node(tun_addr: Ipv4Addr) -> Result, Box> { + match create_tun_interface(tun_addr) { + Ok(tun) => { + println!("Interface '{}' ({}) created", TUN_NAME, tun_addr); + match rtnetlink::new_connection() { + Ok((conn, handle, _)) => { + tokio::spawn(conn); + match add_route(handle.clone()).await { + Ok(_) => { + println!("Static route created"); + }, + Err(e) => { + panic!("Error adding route: {}", e); + } + } + }, + Err(e) => { + panic!("Error creating new handle: {}", e); + } + } + + + Ok(tun) + }, + Err(e) => { + panic!("Error creating TUN: {}", e); + } + } +} \ No newline at end of file diff --git a/src/peer.rs b/src/peer.rs new file mode 100644 index 0000000..b5504b7 --- /dev/null +++ b/src/peer.rs @@ -0,0 +1,63 @@ +use tokio::{ + io::{AsyncReadExt, AsyncWriteExt}, + net::TcpStream, + sync::{mpsc, Mutex}, + select, +}; +use std::{error::Error, sync::Arc}; + +#[derive(Debug)] +pub struct Peer { + pub id: String, + pub to_peer: mpsc::UnboundedSender>, +} + +impl Peer { + pub fn new(id: String, to_tun: mpsc::UnboundedSender>, mut stream: TcpStream) -> Result> { + + // Create channel for each peer + let (to_peer, mut from_tun) = mpsc::unbounded_channel::>(); + + tokio::spawn(async move { + loop { + let link_mtu = 1500; + let mut read_buf = vec![0u8; link_mtu]; + + select! { + // Read from TCP stream, write to 'to_tun' + read_result = stream.read(&mut read_buf) => { + match read_result { + Ok(n) => { + // Truncate buffer, removing any extra bytes + read_buf.truncate(n); + + // For testing purposes + println!("Received bytes from peer: {:?}", read_buf); + + // Send to TUN interface + if let Err(error) = to_tun.send(read_buf.clone()) { + eprintln!("Error sending to TUN: {}", error); + } + }, + Err(error) => { + eprintln!("Error reading from TCP stream: {}", error); + } + } + } + // Read from 'from_tun' receiver, write to TCP stream + Some(packet) = from_tun.recv() => { + if let Err(error) = stream.write_all(&packet).await { + eprintln!("Error writing to TCP stream: {}", error); + } + } + + } + } + }); + + Ok(Self { + id, + to_peer, + }) + } +} \ No newline at end of file diff --git a/src/peer_manager.rs b/src/peer_manager.rs new file mode 100644 index 0000000..3e414f7 --- /dev/null +++ b/src/peer_manager.rs @@ -0,0 +1,67 @@ +use std::collections::HashMap; +use tokio::{sync::mpsc::UnboundedSender, net::TcpStream}; + +use crate::peer::{Peer, self}; +use std::sync::{Arc, Mutex}; +use serde::Deserialize; +use std::net::SocketAddr; + +pub const NODE_CONFIG_FILE_PATH: &str = "nodeconfig.toml"; + + +#[derive(Deserialize)] +struct PeersConfig { + peers: Vec, +} + +pub struct PeerManager { + pub known_peers: Mutex>, +} + +impl PeerManager { + pub fn new(myself_peer: Peer) -> Self { + let mut known_peers: Vec = Vec::new(); + // add itself + known_peers.push(myself_peer); + + Self { + known_peers: Mutex::new(known_peers), + } + } + + pub async fn get_peers_from_config(&self, to_tun: UnboundedSender>) { + // Read from the nodeconfig.toml file + match std::fs::read_to_string(NODE_CONFIG_FILE_PATH) { + Ok(file_content) => { + // Create a PeersConfig based on the file content + let config: PeersConfig = toml::from_str(&file_content).unwrap(); + for peer_addr in config.peers { + match TcpStream::connect(peer_addr).await { + Ok(peer_stream) => { + println!("TCP stream connected: {}", peer_addr); + // Create peer instance + let peer_id = peer_addr.to_string(); + match Peer::new(peer_id, to_tun.clone(), peer_stream) { + Ok(new_peer) => { + // Add peer to known_peers + let mut known_peers = self.known_peers.lock().unwrap(); + known_peers.push(new_peer); + }, + Err(e) => { + eprintln!("Error creating peer: {}", e); + } + } + }, + Err(e) => { + eprintln!("Error connecting to TCP stream for {}: {}", peer_addr.to_string(), e); + } + } + } + + }, + Err(e) => { + eprintln!("Error reading nodeconfig.toml file: {}", e); + } + } + } +} \ No newline at end of file