The testnet can now create tunnels through IP protocol

src/interfaces/ip.rs

@@ -3,16 +3,15 @@ use alloc::string::{String, ToString};
 use alloc::vec;
 use alloc::vec::Vec;
 use core::ops::RangeInclusive;
+#[cfg(test)]
+use core::str::FromStr;
 use core::time::Duration;
 use rayon::prelude::*;
-use std::net;
 use std::net::TcpStream;
-#[cfg(test)]
+use std::{format, net};
-use std::thread;
 
 use crate::interface::{Interface, InterfaceRequirements, TargetingData};
 use crate::message::MessageBytes;
-use crate::res::IFError::General;
 use crate::res::{IFError, IFResult};
 use crate::std::io::{Read, Write};
 use crate::std::println;
@@ -30,10 +29,10 @@ pub struct IPInterface {
     connections: Vec<net::TcpStream>,
     listener: net::TcpListener,
     peers: Vec<Peer>,
-    package_queue: Vec<IPPackage>,
+    package_queue: Vec<(IPPackage, String /* from_peer */)>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct IPPackage {
     version: u8,
     package_type: MessageType,
@@ -41,7 +40,7 @@ struct IPPackage {
     message: MessageBytes,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone)]
 enum MessageType {
     Common,
     PeerRequest,
@@ -58,7 +57,7 @@ impl MessageType {
         }
     }
 
-    fn to_u8(&self) -> u8 {
+    fn as_u8(&self) -> u8 {
         match self {
             MessageType::Common => 0,
             MessageType::PeerRequest => 1,
@@ -71,28 +70,47 @@ impl InterfaceRequirements for IPInterface {}
 
 impl Interface for IPInterface {
     fn main_loop_iteration(&mut self) -> IFResult<()> {
-        println!("Mainloop   {:?}", self.listener.local_addr());
+        if let Some(conn) = self.listener.incoming().next() {
-        println!("Incoming connections: {:?}", self.listener.incoming());
+            match conn {
-
+                Ok(stream) => {
-        match self.listener.accept() {
+                    stream.set_nonblocking(true)?;
-            Ok((stream, addr)) => {
+                    let addr = stream.peer_addr()?;
-                println!("New client: {:?}", addr);
+                    println!(
+                        "({:?}): New client: {:?}",
+                        addr,
+                        self.listener.local_addr().unwrap()
+                    );
                     if self.peers.iter().all(|(ip, _)| *ip != addr.ip()) {
                         self.peers.push((addr.ip(), addr.port()));
                     }
                     self.connections.push(stream)
                 }
-            Err(_e) => return Err(IFError::General(String::from("No incoming connection"))),
+                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {}
+                Err(e) => return Err(IFError::from(e)),
+            }
         }
-
-        println!("Hello from mainloop");
         let mut new_connections: Vec<TcpStream> = vec![];
         for connection in &mut self.connections {
+            connection.set_nonblocking(true)?;
             let mut header: [u8; 6] = [0, 0, 0, 0, 0, 0];
-            connection.read_exact(&mut header)?;
+            match connection.read_exact(&mut header) {
+                Ok(_) => {}
+                Err(ref e)
+                    if e.kind() == std::io::ErrorKind::WouldBlock
+                        || e.kind() == std::io::ErrorKind::UnexpectedEof =>
+                {
+                    continue
+                }
+                Err(e) => {
+                    println!("Error: {:?}", e);
+                    continue;
+                }
+            };
             let version = header[0];
             let package_type = MessageType::from_u8(header[1])?;
             let size = bytes_to_size([header[2], header[3], header[4], header[5]]);
+            connection.set_nonblocking(false)?;
+            connection.set_read_timeout(Some(std::time::Duration::from_millis(500)))?;
 
             let mut message_take = connection.take(size as u64);
             let mut message: Vec<u8> = vec![];
@@ -110,7 +128,7 @@ impl Interface for IPInterface {
                         connection,
                         IPPackage {
                             version,
-                            package_type,
+                            package_type: MessageType::PeersShared,
                             size: message.len() as u32,
                             message,
                         },
@@ -123,7 +141,8 @@ impl Interface for IPInterface {
                         size,
                         message,
                     };
-                    self.package_queue.push(package);
+                    self.package_queue
+                        .push((package, format!("{:?}", connection.peer_addr()?)));
                 }
                 MessageType::PeersShared => {
                     let peers: Vec<Peer> = serde_cbor::from_slice(message.as_slice())?;
@@ -153,62 +172,57 @@ impl Interface for IPInterface {
         &*self.id
     }
     fn send(&mut self, message: &[u8], interface_data: Option<TargetingData>) -> IFResult<()> {
-        let addr: net::SocketAddr = match interface_data {
-            Some(ip_string) => ip_string.parse().expect("Unable to parse address"),
-            None => {
-                return Err(IFError::General(String::from(
-                    "Not enough info to create connections",
-                )))
-            }
-        };
-
-        println!("Connecting to {:?}", addr);
-
-        let index = match self
-            .connections
-            .iter()
-            .position(|connection| connection.peer_addr().ok() == Some(addr))
-        {
-            None => {
-                let connection = match net::TcpStream::connect_timeout(&addr, Duration::new(1, 0)) {
-                    Ok(connection) => connection,
-                    Err(_) => return Err(General(String::from("Can't connect to this port"))),
-                };
-                self.connections.push(connection);
-                self.connections.len() - 1
-            }
-            Some(i) => i,
-        };
         println!(
-            "Sending message to {:?}",
+            "({:?}): Connecting to {:?} to send a message",
-            self.connections[index].peer_addr().unwrap()
+            self.listener.local_addr().unwrap(),
+            interface_data
         );
 
-        self.connections[index].set_write_timeout(Some(Duration::new(1, 0)))?;
+        let package = IPPackage {
-
-        IPInterface::send_package(
-            &mut self.connections[index],
-            IPPackage {
             version: 0,
             package_type: MessageType::Common,
             size: message.len() as u32,
             message: Vec::from(message),
-            },
+        };
-        )?;
+
+        match interface_data {
+            Some(ip_string) => {
+                let addr: net::SocketAddr = ip_string.parse().expect("Unable to parse address");
+                let index = self.obtain_connection(&(addr.ip(), addr.port()))?;
+                println!(
+                    "({:?}): We have a connection to {:?}",
+                    self.listener.local_addr().unwrap(),
+                    self.connections[index].peer_addr().unwrap()
+                );
+                IPInterface::send_package(&mut self.connections[index], package)?;
+            }
+            None => {
+                for conn in &mut self.connections {
+                    IPInterface::send_package(conn, package.clone())?;
+                }
+            }
+        };
         println!("Sent message");
         Ok(())
     }
     fn receive(&mut self) -> IFResult<Option<(MessageBytes, TargetingData)>> {
+        if !self.package_queue.is_empty() {
+            println!(
+                "({:?}): New message from {}",
+                self.listener.local_addr().unwrap(),
+                self.package_queue.last().unwrap().1
+            );
+        }
         match self.package_queue.pop() {
-            Some(ip_package) => Ok(Some((ip_package.message, "".to_string()))),
+            Some((ip_package, data)) => Ok(Some((ip_package.message, data))),
             None => Ok(None),
         }
     }
 }
 
 impl IPInterface {
-    pub fn new(peers: Vec<Peer>) -> IFResult<Self> {
+    pub fn new(port: u16, peers: Vec<Peer>) -> IFResult<Self> {
-        let listener = match create_tcp_listener() {
+        let listener = match create_tcp_listener(port) {
             Some(listener) => listener,
             None => {
                 return Err(IFError::General(String::from(
@@ -250,7 +264,10 @@ impl IPInterface {
     }
 
     fn send_package(stream: &mut net::TcpStream, package: IPPackage) -> IFResult<()> {
-        let mut header: Vec<u8> = vec![package.version, package.package_type.to_u8()];
+        stream.set_write_timeout(Some(std::time::Duration::from_millis(700)))?;
+        #[cfg(test)]
+        stream.set_nonblocking(false)?;
+        let mut header: Vec<u8> = vec![package.version, package.package_type.as_u8()];
         for byte in size_to_bytes(package.size) {
             header.push(byte);
         }
@@ -280,22 +297,26 @@ impl IPInterface {
         Ok(())
     }
 
-    fn obtain_connection(&mut self, addr: &Peer) -> IFResult<()> {
+    fn obtain_connection(&mut self, addr: &Peer) -> IFResult<usize> {
-        if self
+        fn compare_addrs(peer: &Peer, addr: net::SocketAddr) -> bool {
-            .connections
+            addr.ip() == peer.0 && addr.port() == peer.1
-            .iter()
+        }
-            .any(|con| con.peer_addr().is_ok() && con.peer_addr().unwrap().ip() == addr.0)
+
-        {
+        if let Some(pos) = self.connections.iter().position(|con| {
-            return Ok(());
+            con.peer_addr().is_ok() && compare_addrs(addr, con.peer_addr().unwrap())
+        }) {
+            return Ok(pos);
         }
         if let Some(conn) = Self::new_connection(addr)? {
-            self.connections.push(conn)
+            self.connections.push(conn);
+            Ok(self.connections.len() - 1)
+        } else {
+            Err(IFError::CouldNotConnect)
         }
-        Ok(())
     }
 
     fn new_connection(addr: &Peer) -> IFResult<Option<TcpStream>> {
-        for port in addr.1 - 5..addr.1 + 5 {
+        for port in addr.1..addr.1 + 3 {
             match net::TcpStream::connect_timeout(
                 &net::SocketAddr::new(addr.0, port as u16),
                 Duration::from_millis(500),
@@ -310,8 +331,8 @@ impl IPInterface {
     }
 }
 
-fn create_tcp_listener() -> Option<net::TcpListener> {
+fn create_tcp_listener(port: u16) -> Option<net::TcpListener> {
-    for port in SOCKET_RANGE {
+    for port in port..port + 5 {
         match net::TcpListener::bind("127.0.0.1:".to_owned() + &port.to_string()) {
             Ok(listener) => return Some(listener),
             Err(_e) => {}
@@ -349,21 +370,24 @@ fn bytes_to_size(arr: [u8; 4]) -> u32 {
 #[test]
 fn test_creating_connection() -> IFResult<()> {
     let message = *b"Hello world from ironforest";
+    let original_msg_copy = message;
 
-    let mut interface1 = IPInterface::new(vec![])?;
+    let mut interface1 = IPInterface::new(50000, vec![])?;
-    let mut interface2 = IPInterface::new(vec![])?;
+    let mut interface2 = IPInterface::new(50001, vec![])?;
 
+    let t2 = std::thread::spawn(move || {
+        for _ in 0..30 {
+            interface2.main_loop_iteration().unwrap();
+            std::thread::sleep(std::time::Duration::from_millis(150));
+        }
+        interface2
+    });
     let t1 = std::thread::spawn(move || {
         interface1
             .send(&message, Some(String::from("127.0.0.1:50001")))
             .unwrap();
         interface1
     });
-    thread::sleep(Duration::from_millis(10));
-    let t2 = std::thread::spawn(move || {
-        interface2.main_loop_iteration().unwrap();
-        interface2
-    });
     let res1 = t1.join();
     match res1 {
         Ok(_res) => {
@@ -377,8 +401,14 @@ fn test_creating_connection() -> IFResult<()> {
             println!("Thread Ok");
             match res.receive() {
                 Ok(tmp) => match tmp {
-                    Some((message, _metadata)) => println!("Received {:?}", message),
+                    Some((message, _metadata)) => {
-                    None => println!("None"),
+                        println!("Received {:?}", message);
+                        assert_eq!(message, original_msg_copy)
+                    }
+                    None => {
+                        println!("None");
+                        panic!();
+                    }
                 },
                 Err(e) => println!("{:?}", e),
             }
@@ -389,4 +419,17 @@ fn test_creating_connection() -> IFResult<()> {
 }
 
 #[cfg(test)]
-pub mod test_ip_interface {}
+fn create_test_interfaces(n: usize) -> impl Iterator<Item = IPInterface> {
+    let ip_addr = std::net::IpAddr::from_str("127.0.0.1").unwrap();
+    (0..n).map(move |i| {
+        IPInterface::new(
+            (5000 + 5 * i) as u16,
+            // (0..n)
+            //     .filter(|j| *j != i)
+            //     .map(|j| (ip_addr, (5000 + 5 * j) as u16))
+            //     .collect(),
+            vec![(ip_addr, (5000 + 5 * ((i + 5) % n)) as u16)],
+        )
+        .unwrap()
+    })
+}

src/ironforce.rs

@@ -3,8 +3,13 @@ use crate::message::{Message, MessageType, ServiceMessageType};
 use crate::res::{IFError, IFResult};
 use crate::transport::Transport;
 use crate::tunnel::{Tunnel, TunnelPublic};
+use alloc::collections::BTreeMap;
 use alloc::vec;
 use alloc::vec::Vec;
+#[cfg(feature = "std")]
+use std::println;
+
+const TUNNEL_MAX_REPEAT_COUNT: u32 = 3;
 
 /// Main worker
 pub struct IronForce {
@@ -23,11 +28,19 @@ pub struct IronForce {
     /// Tunnels that has not been confirmed yet (no backward spread)
     ///
     /// `[(Tunnel, Optional target node, local peer ids)]`
-    tunnels_pending: Vec<(TunnelPublic, Option<PublicKey> /* target node */, (u64, u64) /* local peer ids */)>,
+    tunnels_pending: Vec<(
+        TunnelPublic,
+        Option<PublicKey>, /* target node */
+        (u64, u64),        /* local peer ids */
+    )>,
     /// True if this instance has background thread
     has_background_worker: bool,
     /// Messages that were already processed (stored to avoid "echo chambers")
     processed_messages: Vec<u64>,
+    /// Counters of how many times the tunnel has passed through this node on its forward movement (so that we don't do a shitposting)
+    ///
+    /// Maps tunnel's first local_id to the number
+    tunnel_counters: BTreeMap<u64, u32>,
 }
 
 impl IronForce {
@@ -42,12 +55,19 @@ impl IronForce {
             tunnels_pending: vec![],
             has_background_worker: false,
             processed_messages: vec![],
+            tunnel_counters: Default::default(),
         }
     }
 
     /// Create a new tunnel to another node
     fn initialize_tunnel_creation(&mut self, destination: PublicKey) -> IFResult<()> {
         let tunnel = TunnelPublic::new_singlecast();
+        #[cfg(std)]
+        println!(
+            "[{}] Tunnel for initialization: {:?}",
+            self.short_id(),
+            tunnel
+        );
         self.tunnels_pending
             .push((tunnel.clone(), Some(destination.clone()), (0, 0)));
         let message = Message::build()
@@ -77,7 +97,16 @@ impl IronForce {
         mut message: Message,
         direction: Option<bool>,
     ) -> IFResult<()> {
-        let tunnel: Tunnel = if let Some(tun) = self.tunnels.iter().cloned().find(|t| t.id == Some(tunnel_id)) { tun } else { return Err(IFError::TunnelNotFound) };
+        let tunnel: Tunnel = if let Some(tun) = self
+            .tunnels
+            .iter()
+            .cloned()
+            .find(|t| t.id == Some(tunnel_id))
+        {
+            tun
+        } else {
+            return Err(IFError::TunnelNotFound);
+        };
         message.tunnel_id = tunnel_id;
         let peer_ids = match (direction, tunnel.peer_ids) {
             (_, (x, 0)) => vec![x],
@@ -120,10 +149,21 @@ impl IronForce {
         if self.processed_messages.contains(&message.message_id) {
             return Ok(());
         }
+        #[cfg(feature = "std")]
+        println!("[{}] {:?}", self.short_id(), message);
         self.processed_messages.push(message.message_id);
         match &message.message_type {
-            MessageType::Service(msg_type) => match msg_type {
+            MessageType::Service(msg_type) => {
+                match msg_type {
                     ServiceMessageType::TunnelBuildingForwardMovement(tunnel, sender_enc) => {
+                        let count = *self
+                            .tunnel_counters
+                            .get(&tunnel.local_ids[0])
+                            .unwrap_or(&0u32);
+                        if count > TUNNEL_MAX_REPEAT_COUNT {
+                            return Ok(());
+                        }
+                        self.tunnel_counters.insert(tunnel.local_ids[0], count + 1);
                         if message.check_recipient(&self.keys) {
                             let mut tunnel_pub = tunnel.clone();
                             tunnel_pub.id = Some(rand::random());
@@ -135,31 +175,47 @@ impl IronForce {
                                 ttd: 0,
                                 nodes_in_tunnel: None,
                                 is_multicast: false,
-                            target_node: Some(sender.clone()),
+                                target_node: Some(sender),
                             };
+                            #[cfg(feature = "std")]
+                            println!(
+                                "[{}] Got an incoming tunnel for me! {:?}",
+                                self.short_id(),
+                                tunnel_pub
+                            );
                             self.tunnels.push(tunnel);
-                        self.send_to_all(
+                            self.transport.send_message(
-                            Message::build()
+                                serde_cbor::to_vec(
+                                    &Message::build()
                                         .message_type(MessageType::Service(
-                                    ServiceMessageType::TunnelBuildingBackwardMovement(tunnel_pub.clone()),
+                                            ServiceMessageType::TunnelBuildingBackwardMovement(
+                                                tunnel_pub.clone(),
+                                            ),
                                         ))
                                         .tunnel(tunnel_pub.id.unwrap())
                                         .sign(&self.keys)
-                                .build()?
+                                        .build()?,
+                                )?,
+                                Some(inc_peer),
                             )?;
                         } else {
                             let mut tunnel = tunnel.clone();
-                        tunnel.local_ids.push(rand::random());
+                            tunnel.add_local_id();
-                        self.tunnels_pending.push((tunnel.clone(), None, (inc_peer, 0)));
+                            self.tunnels_pending
+                                .push((tunnel.clone(), None, (inc_peer, 0)));
                             self.send_to_all(message)?;
                         }
                     }
                     ServiceMessageType::TunnelBuildingBackwardMovement(tunnel_p) => {
-                    match self
+                        #[cfg(feature = "std")]
-                        .tunnels_pending
+                        println!(
-                        .iter()
+                            "[{}] Pending tunnels: {:?}",
-                        .find(|tun| tunnel_p.local_ids.contains(tun.0.local_ids.last().unwrap()))
+                            self.short_id(),
-                    {
+                            self.tunnels_pending
+                        );
+                        match self.tunnels_pending.iter().find(|tun| {
+                            tunnel_p.local_ids.contains(tun.0.local_ids.last().unwrap())
+                        }) {
                             // This doesn't concern us
                             None => {}
                             // This is a tunnel initialization proposed by us (and we got it back, yay)
@@ -174,6 +230,8 @@ impl IronForce {
                                     target_node: Some(target.clone()),
                                 };
                                 self.tunnels.push(tunnel);
+                                #[cfg(feature = "std")]
+                                println!("[{}] Successfully created a new tunnel", self.short_id());
                                 // Send some initialization message or something
                             }
                             // This is a tunnel initialization proposed by someone else that has passed through us on its forward movement
@@ -185,14 +243,18 @@ impl IronForce {
                                     ttd: 0,
                                     nodes_in_tunnel: None,
                                     is_multicast: false,
-                                target_node: None
+                                    target_node: None,
                                 };
                                 self.tunnels.push(tunnel);
-                            self.transport.send_message(serde_cbor::to_vec(&message)?, Some(peers.0))?;
+                                #[cfg(feature = "std")]
+                                println!("[{}] Successfully created a new tunnel", self.short_id());
+                                self.transport
+                                    .send_message(serde_cbor::to_vec(&message)?, Some(peers.0))?;
+                            }
+                        }
                     }
                 }
             }
-            },
             MessageType::SingleCast | MessageType::Broadcast => self.messages.push(message),
         }
         Ok(())
@@ -210,6 +272,19 @@ impl IronForce {
         }
         Ok(())
     }
+
+    fn short_id(&self) -> alloc::string::String {
+        let vec_data = self.keys.get_public().to_vec();
+        alloc::string::String::from_utf8(
+            vec_data
+                .iter()
+                .skip(90)
+                .take(5)
+                .map(|c| c % 26 + 97)
+                .collect::<Vec<u8>>(),
+        )
+        .unwrap()
+    }
 }
 
 #[cfg(test)]
@@ -217,12 +292,12 @@ mod if_testing {
     use crate::crypto::Keys;
     use crate::interface::test_interface::create_test_interfaces;
     use crate::ironforce::IronForce;
+    use crate::message::{Message, MessageType};
     use crate::res::IFResult;
     use crate::transport::Transport;
     use alloc::boxed::Box;
     use alloc::vec;
     use alloc::vec::Vec;
-    use crate::message::{Message, MessageType};
 
     fn create_test_network() -> Vec<IronForce> {
         let interfaces = create_test_interfaces(5);
@@ -239,6 +314,7 @@ mod if_testing {
                 tunnels_pending: vec![],
                 has_background_worker: false,
                 processed_messages: vec![],
+                tunnel_counters: Default::default(),
             })
             .collect()
     }
@@ -271,11 +347,119 @@ mod if_testing {
                 .recipient(key_1.clone())
                 .content(b"hello".to_vec())
                 .build()?,
-            key_1)?;
+            key_1,
+        )?;
         network[1].main_loop_iteration()?;
         let msg = network[1].read_message();
         assert!(msg.is_some());
-        assert_eq!(msg.unwrap().get_decrypted(&network[1].keys).unwrap().as_slice(), b"hello");
+        assert_eq!(
+            msg.unwrap()
+                .get_decrypted(&network[1].keys)
+                .unwrap()
+                .as_slice(),
+            b"hello"
+        );
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+#[cfg(feature = "std")]
+mod test_with_ip {
+    use crate::crypto::Keys;
+    use crate::interfaces::ip::IPInterface;
+    use crate::ironforce::IronForce;
+    use crate::res::IFResult;
+    use crate::transport::Transport;
+    use alloc::boxed::Box;
+    use alloc::vec;
+    use alloc::vec::Vec;
+    use core::str::FromStr;
+    use std::println;
+
+    fn create_test_interfaces(n: usize) -> impl Iterator<Item = IPInterface> {
+        let ip_addr = std::net::IpAddr::from_str("127.0.0.1").unwrap();
+        (0..n).map(move |i| {
+            IPInterface::new(
+                (5000 + 5 * i) as u16,
+                (0..n)
+                    .filter(|j| *j != i)
+                    .map(|j| (ip_addr, (5000 + 5 * j) as u16))
+                    .collect(),
+            )
+            .unwrap()
+        })
+    }
+
+    fn create_test_network() -> Vec<IronForce> {
+        let interfaces = create_test_interfaces(4);
+        let transports = interfaces
+            .into_iter()
+            .map(|interface| Transport::new(vec![Box::new(interface)]));
+        transports
+            .map(|tr| IronForce {
+                keys: Keys::generate(),
+                transport: tr,
+                additional_modules: vec![],
+                tunnels: vec![],
+                messages: vec![],
+                tunnels_pending: vec![],
+                has_background_worker: false,
+                processed_messages: vec![],
+                tunnel_counters: Default::default()
+            })
+            .collect()
+    }
+
+    #[test]
+    fn test_creating_a_tunnel() -> IFResult<()> {
+        let mut network = create_test_network();
+        let key_1 = network[1].keys.get_public();
+        let (mut node0, mut node1) = (network.remove(0), network.remove(0));
+        println!("node0 id: {}", node0.short_id());
+        println!("node1 id: {}", node1.short_id());
+        let (mut node2, mut node3) = (network.remove(0), network.remove(0));
+        let t1 = std::thread::spawn(move || {
+            for _i in 0..5 {
+                // println!("Iteration {} (1)", i);
+                node0.main_loop_iteration().unwrap();
+            }
+            node0
+        });
+        let t2 = std::thread::spawn(move || {
+            for _i in 0..15 {
+                // println!("Iteration {} (2)", i);
+                node1.main_loop_iteration().unwrap();
+            }
+            node1
+        });
+        std::thread::spawn(move || loop {
+            node2.main_loop_iteration().unwrap();
+            std::thread::sleep(std::time::Duration::from_secs(5));
+        });
+        std::thread::spawn(move || loop {
+            std::thread::sleep(std::time::Duration::from_secs(5));
+            node3.main_loop_iteration().unwrap();
+        });
+        let mut node0 = t1.join().unwrap();
+        node0.initialize_tunnel_creation(key_1)?;
+        let mut node1 = t2.join().unwrap();
+        let t1 = std::thread::spawn(move || {
+            for _ in 0..18 {
+                node0.main_loop_iteration().unwrap();
+                std::thread::sleep(std::time::Duration::from_millis(150));
+            }
+            node0
+        });
+        let t2 = std::thread::spawn(move || {
+            for _ in 0..18 {
+                node1.main_loop_iteration().unwrap();
+            }
+            node1
+        });
+        let node0 = t1.join().unwrap();
+        t2.join().unwrap();
+        assert!(!node0.tunnels.is_empty());
         Ok(())
     }
 }

src/res.rs

@@ -9,6 +9,8 @@ pub enum IFError {
     General(String),
     /// A tunnel satisfying some conditions has not been found
     TunnelNotFound,
+    /// Could not establish a connection
+    CouldNotConnect,
     /// Error during serialization
     SerializationError(String),
     /// Error in rsa

src/tunnel.rs

@@ -41,13 +41,15 @@ pub struct TunnelPublic {
 
 impl TunnelPublic {
     pub fn new_singlecast() -> Self {
-        Self {
+        let mut tun = Self {
             id: None,
-            local_ids: vec![rand::random()],
+            local_ids: vec![],
             ttd: 0,
             nodes_in_tunnel: None,
             is_multicast: false,
-        }
+        };
+        tun.add_local_id();
+        tun
     }
 
     /// Get the hash of the tunnel for verification
@@ -67,6 +69,17 @@ impl TunnelPublic {
             is_multicast: true,
         }
     }
+
+    pub fn add_local_id(&mut self) -> u64 {
+        let local_id = rand::random();
+        // Add 0 to 7 random ids so it's impossible to get the length of the tunnel
+        // todo: enable it (after debug)
+        // for _ in 0..(rand::random() as u64 % 7) {
+        //     self.local_ids.push(rand::random())
+        // }
+        self.local_ids.push(local_id);
+        local_id
+    }
 }
 
 #[test]