Added config option to ignore all nodes except from Yggdrasil.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "alfis"
-version = "0.3.6"
+version = "0.3.7"
 authors = ["Revertron <alfis@revertron.com>"]
 edition = "2018"
 build = "build.rs"

alfis.toml

@@ -1,35 +1,33 @@
-# Main settings
-
 # The hash of first block in a chain to know with which nodes to work
 origin = "00000102C2F9BFD2803284D93327F089D60FC72A06F19AF2384567F2646B8348"
 # A path to your key file to load autamatically
 key_file = "default.key"
+
+# Network settings
+[net]
+# All bootstap nodes
+peers = ["test-ip4.alfis.name:4244", "test-ip6.alfis.name:4244"]
 # Your node will listen on that address for other nodes to connect
 listen = "[::]:4244"
 # Set true if you want your IP to participate in peer-exchange, or false otherwise
 public = true
-
-# Bootstrap nodes
-
-# All bootstap nodes
-#peers = ["test-ip4.alfis.name:4244", "test-ip6.alfis.name:4244"]
-# Yggdrasil nodes only
-peers = ["test-ip6.alfis.name:4244"]
+# Allow connections to/from Yggdrasil only (https://yggdrasil-network.github.io)
+yggdrasil_only = false
 
 # DNS server options
 [dns]
 # Your DNS resolver will be listening on this address and port (Usual port is 53)
-listen = "127.0.0.1:5300"
+listen = "127.0.0.1:53"
 # How many threads to spawn by DNS server
 threads = 20
 # AdGuard DNS servers to filter ads and trackers
-#forwarders = ["94.140.14.14:53", "94.140.15.15:53"]
+forwarders = ["94.140.14.14:53", "94.140.15.15:53"]
 # Wyrd servers
-forwarders = ["[301:2522::53]:53", "[303:8b1a::53]:53"]
+#forwarders = ["[301:2522::53]:53", "[303:8b1a::53]:53"]
 # Cloudflare servers
 #forwarders = ["1.1.1.1:53", "1.0.0.1:53"]
 
 #Mining options
 [mining]
-# How many CPU threads to spawn for mining
+# How many CPU threads to spawn for mining, zero = number of cores
 threads = 0

src/commons/mod.rs

@@ -3,6 +3,7 @@ use rand::Rng;
 
 pub mod constants;
 pub use constants::*;
+use std::net::IpAddr;
 
 /// Convert bytes array to HEX format
 pub fn to_hex(buf: &[u8]) -> String {
@@ -80,9 +81,20 @@ pub fn random_string(length: usize) -> String {
     result
 }
 
+/// Checks if this IP is from Yggdrasil network
+/// https://yggdrasil-network.github.io
+pub fn is_yggdrasil(addr: &IpAddr) -> bool {
+    if let IpAddr::V6(ipv6) = addr {
+        let first_byte = ipv6.octets()[0];
+        return first_byte == 2 || first_byte == 3;
+    }
+    false
+}
+
 #[cfg(test)]
 mod test {
-    use crate::check_domain;
+    use crate::{check_domain, is_yggdrasil};
+    use std::net::IpAddr;
 
     #[test]
     fn test_check_domain() {
@@ -98,4 +110,20 @@ mod test {
         assert!(!check_domain(".ab.c", true));
         assert!(!check_domain("ab.c-", true));
     }
+
+    #[test]
+    fn test_is_yggdrasil() {
+        let addr: IpAddr = "200::1".parse().unwrap();
+        assert!(is_yggdrasil(&addr));
+        let addr: IpAddr = "226::1".parse().unwrap();
+        assert!(is_yggdrasil(&addr));
+        let addr: IpAddr = "300::1".parse().unwrap();
+        assert!(is_yggdrasil(&addr));
+        let addr: IpAddr = "326::1".parse().unwrap();
+        assert!(is_yggdrasil(&addr));
+        let addr: IpAddr = "2001::1".parse().unwrap();
+        assert!(!is_yggdrasil(&addr));
+        let addr: IpAddr = "2201::1".parse().unwrap();
+        assert!(!is_yggdrasil(&addr));
+    }
 }

src/p2p/network.rs

@@ -15,7 +15,7 @@ use log::{trace, debug, info, warn, error};
 
 use std::net::{SocketAddr, IpAddr, SocketAddrV4, Shutdown};
 use std::collections::HashSet;
-use crate::{Context, Block, p2p::Message, p2p::State, p2p::Peer, p2p::Peers, Bytes};
+use crate::{Context, Block, p2p::Message, p2p::State, p2p::Peer, p2p::Peers, Bytes, is_yggdrasil};
 use crate::blockchain::enums::BlockQuality;
 use crate::commons::CHAIN_VERSION;
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -36,9 +36,9 @@ impl Network {
     }
 
     pub fn start(&mut self) -> Result<(), String> {
-        let (listen_addr, peers_addrs) = {
+        let (listen_addr, peers_addrs, yggdrasil_only) = {
             let c = self.context.lock().unwrap();
-            (c.settings.listen.clone(), c.settings.peers.clone())
+            (c.settings.net.listen.clone(), c.settings.net.peers.clone(), c.settings.net.yggdrasil_only)
         };
 
         let running = Arc::new(AtomicBool::new(true));
@@ -61,7 +61,7 @@ impl Network {
             // States of peer connections, and some data to send when sockets become writable
             let mut peers = Peers::new();
             // Starting peer connections to bootstrap nodes
-            peers.connect_peers(peers_addrs, &poll.registry(), &mut unique_token);
+            peers.connect_peers(peers_addrs, &poll.registry(), &mut unique_token, yggdrasil_only);
 
             loop {
                 // Poll Mio for events, blocking until we get an event.
@@ -89,6 +89,13 @@ impl Network {
                                         }
                                     }
 
+                                    if yggdrasil_only && !is_yggdrasil(&address.ip()) {
+                                        info!("Dropping connection from Internet");
+                                        stream.shutdown(Shutdown::Both).unwrap_or_else(|e|{ warn!("Error in shutdown, {}", e); });
+                                        let _ = poll.registry().reregister(&mut server, SERVER, Interest::READABLE);
+                                        continue;
+                                    }
+
                                     // If connection is from the same IP and not from loopback we ignore it to avoid connection loops
                                     let local_ip = stream.local_addr().unwrap_or("0.0.0.0:0".parse().unwrap());
                                     if !local_ip.ip().is_loopback() && local_ip.ip() == address.ip() {
@@ -104,7 +111,7 @@ impl Network {
                                 }
                                 Err(_) => {}
                             }
-                            poll.registry().reregister(&mut server, SERVER, Interest::READABLE).expect("Error reregistering server");
+                            let _ = poll.registry().reregister(&mut server, SERVER, Interest::READABLE);
                         }
                         token => {
                             if !handle_connection_event(Arc::clone(&context), &mut peers, &poll.registry(), &event) {
@@ -130,7 +137,7 @@ impl Network {
                 };
                 mine_locker_block(Arc::clone(&context));
                 peers.send_pings(poll.registry(), height, hash);
-                peers.connect_new_peers(poll.registry(), &mut unique_token);
+                peers.connect_new_peers(poll.registry(), &mut unique_token, yggdrasil_only);
             }
             info!("Network loop finished");
         });
@@ -209,7 +216,7 @@ fn handle_connection_event(context: Arc<Mutex<Context>>, peers: &mut Peers, regi
                         debug!("Sending hello to {}", &peer.get_addr());
                         let data: String = {
                             let c = context.lock().unwrap();
-                            let message = Message::hand(&c.app_version, &c.settings.origin, CHAIN_VERSION, c.settings.public, peer.get_rand());
+                            let message = Message::hand(&c.app_version, &c.settings.origin, CHAIN_VERSION, c.settings.net.public, peer.get_rand());
                             serde_json::to_string(&message).unwrap()
                         };
                         send_message(peer.get_stream(), &data.into_bytes()).unwrap_or_else(|e| warn!("Error sending hello {}", e));

src/p2p/peers.rs

@@ -9,7 +9,7 @@ use rand::random;
 use rand::seq::IteratorRandom;
 #[allow(unused_imports)]
 use log::{trace, debug, info, warn, error};
-use crate::Bytes;
+use crate::{Bytes, is_yggdrasil};
 use crate::commons::MAX_RECONNECTS;
 
 pub struct Peers {
@@ -252,7 +252,7 @@ impl Peers {
         }
     }
 
-    pub fn connect_new_peers(&mut self, registry: &Registry, unique_token: &mut Token) {
+    pub fn connect_new_peers(&mut self, registry: &Registry, unique_token: &mut Token, yggdrasil_only: bool) {
         if self.new_peers.is_empty() {
             return;
         }
@@ -260,6 +260,10 @@ impl Peers {
             if self.ignored.contains(&addr.ip()) {
                 continue;
             }
+            if yggdrasil_only && !is_yggdrasil(&addr.ip()) {
+                info!("Ignoring not Yggdrasil address '{}'", &addr.ip());
+                continue;
+            }
             match TcpStream::connect(addr.clone()) {
                 Ok(mut stream) => {
                     info!("Created connection to peer {}", &addr);
@@ -278,7 +282,7 @@ impl Peers {
     }
 
     /// Connecting to configured (bootstrap) peers
-    pub fn connect_peers(&mut self, peers_addrs: Vec<String>, registry: &Registry, unique_token: &mut Token) {
+    pub fn connect_peers(&mut self, peers_addrs: Vec<String>, registry: &Registry, unique_token: &mut Token, yggdrasil_only: bool) {
         for peer in peers_addrs.iter() {
             let addresses: Vec<SocketAddr> = match peer.to_socket_addrs() {
                 Ok(peers) => { peers.collect() }
@@ -286,6 +290,10 @@ impl Peers {
             };
 
             for addr in addresses {
+                if yggdrasil_only && !is_yggdrasil(&addr.ip()) {
+                    info!("Ignoring not Yggdrasil address '{}'", &addr.ip());
+                    continue;
+                }
                 match TcpStream::connect(addr.clone()) {
                     Ok(mut stream) => {
                         info!("Created connection to peer {}", &addr);

src/settings.rs

@@ -13,12 +13,8 @@ pub struct Settings {
     pub origin: String,
     #[serde(default)]
     pub key_file: String,
-    #[serde(default = "default_listen")]
-    pub listen: String,
-    #[serde(default)]
-    pub public: bool,
     #[serde(default)]
-    pub peers: Vec<String>,
+    pub net: Net,
     #[serde(default)]
     pub dns: Dns,
     #[serde(default)]
@@ -66,11 +62,9 @@ impl Settings {
 impl Default for Settings {
     fn default() -> Self {
         Self {
-            origin: "".to_string(),
-            key_file: "".to_string(),
-            listen: String::from("[::]:4244"),
-            public: false,
-            peers: vec![],
+            origin: String::from("00000102C2F9BFD2803284D93327F089D60FC72A06F19AF2384567F2646B8348"),
+            key_file: String::from("default.key"),
+            net: Net::default(),
             dns: Default::default(),
             mining: Mining::default()
         }
@@ -88,7 +82,11 @@ pub struct Dns {
 
 impl Default for Dns {
     fn default() -> Self {
-        Dns { listen: String::from("0.0.0.0:53"), threads: 20, forwarders: vec!["94.140.14.14:53".to_owned(), "94.140.15.15:53".to_owned()] }
+        Dns {
+            listen: String::from("127.0.0.1:53"),
+            threads: 20,
+            forwarders: vec![String::from("94.140.14.14:53"), String::from("94.140.15.15:53")]
+        }
     }
 }
 
@@ -98,6 +96,29 @@ pub struct Mining {
     pub threads: usize
 }
 
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Net {
+    #[serde(default)]
+    pub peers: Vec<String>,
+    #[serde(default = "default_listen")]
+    pub listen: String,
+    #[serde(default)]
+    pub public: bool,
+    #[serde(default)]
+    pub yggdrasil_only: bool,
+}
+
+impl Default for Net {
+    fn default() -> Self {
+        Net {
+            peers: vec![String::from("test-ip4.alfis.name:4244"), String::from("test-ip6.alfis.name:4244")],
+            listen: String::from("[::]:4244"),
+            public: true,
+            yggdrasil_only: false
+        }
+    }
+}
+
 fn default_listen() -> String {
     String::from("[::]:4244")
 }