_ Git - dnsseed-rust/blob - src/main.rs

   1 mod printer;
   2 mod reader;
   3 mod peer;
   4 mod timeout_stream;
   5 mod datastore;
   6
   7 use std::{cmp, env};
   8 use std::collections::HashMap;
   9 use std::sync::{Arc, Mutex};
  10 use std::sync::atomic::{Ordering, AtomicBool};
  11 use std::time::{Duration, Instant};
  12 use std::net::{SocketAddr, ToSocketAddrs};
  13
  14 use bitcoin_hashes::sha256d;
  15
  16 use bitcoin::blockdata::block::Block;
  17 use bitcoin::blockdata::constants::genesis_block;
  18 use bitcoin::network::constants::Network;
  19 use bitcoin::network::message::NetworkMessage;
  20 use bitcoin::network::message_blockdata::{GetHeadersMessage, Inventory, InvType};
  21 use bitcoin::util::hash::BitcoinHash;
  22
  23 use printer::{Printer, Stat};
  24 use peer::Peer;
  25 use datastore::{AddressState, Store, U64Setting, RegexSetting};
  26 use timeout_stream::TimeoutStream;
  27 use rand::Rng;
  28
  29 use tokio::prelude::*;
  30 use tokio::timer::Delay;
  31
  32 static mut REQUEST_BLOCK: Option<Box<Mutex<Arc<(u64, sha256d::Hash, Block)>>>> = None;
  33 static mut HIGHEST_HEADER: Option<Box<Mutex<(sha256d::Hash, u64)>>> = None;
  34 static mut HEADER_MAP: Option<Box<Mutex<HashMap<sha256d::Hash, u64>>>> = None;
  35 static mut HEIGHT_MAP: Option<Box<Mutex<HashMap<u64, sha256d::Hash>>>> = None;
  36 static mut DATA_STORE: Option<Box<Store>> = None;
  37 static mut PRINTER: Option<Box<Printer>> = None;
  38 pub static START_SHUTDOWN: AtomicBool = AtomicBool::new(false);
  39 static SCANNING: AtomicBool = AtomicBool::new(false);
  40
  41 struct PeerState {
  42         request: Arc<(u64, sha256d::Hash, Block)>,
  43         node_services: u64,
  44         msg: (String, bool),
  45         fail_reason: AddressState,
  46         recvd_version: bool,
  47         recvd_verack: bool,
  48         recvd_pong: bool,
  49         recvd_addrs: bool,
  50         recvd_block: bool,
  51         pong_nonce: u64,
  52 }
  53
  54 pub fn scan_node(scan_time: Instant, node: SocketAddr, manual: bool) {
  55         if START_SHUTDOWN.load(Ordering::Relaxed) { return; }
  56         let printer = unsafe { PRINTER.as_ref().unwrap() };
  57         let store = unsafe { DATA_STORE.as_ref().unwrap() };
  58
  59         let mut rng = rand::thread_rng();
  60         let peer_state = Arc::new(Mutex::new(PeerState {
  61                 recvd_version: false,
  62                 recvd_verack: false,
  63                 recvd_pong: false,
  64                 recvd_addrs: false,
  65                 recvd_block: false,
  66                 pong_nonce: rng.gen(),
  67                 node_services: 0,
  68                 fail_reason: AddressState::Timeout,
  69                 msg: (String::new(), false),
  70                 request: Arc::clone(&unsafe { REQUEST_BLOCK.as_ref().unwrap() }.lock().unwrap()),
  71         }));
  72         let err_peer_state = Arc::clone(&peer_state);
  73         let final_peer_state = Arc::clone(&peer_state);
  74
  75         let peer = Delay::new(scan_time).then(move |_| {
  76                 printer.set_stat(Stat::NewConnection);
  77                 let timeout = store.get_u64(U64Setting::RunTimeout);
  78                 Peer::new(node.clone(), Duration::from_secs(timeout), printer)
  79         });
  80         tokio::spawn(peer.and_then(move |(mut write, read)| {
  81                 TimeoutStream::new_timeout(read, scan_time + Duration::from_secs(store.get_u64(U64Setting::RunTimeout))).map_err(move |err| {
  82                         match err {
  83                                 bitcoin::consensus::encode::Error::UnrecognizedNetworkCommand(ref msg) => {
  84                                         // If we got here, we hit one of the explicitly disallowed messages indicating
  85                                         // a bogus "node".
  86                                         let mut state_lock = err_peer_state.lock().unwrap();
  87                                         state_lock.msg = (format!("(bad msg type {})", msg), true);
  88                                         state_lock.fail_reason = AddressState::EvilNode;
  89                                 },
  90                                 _ => {},
  91                         }
  92                         ()
  93                 }).for_each(move |msg| {
  94                         let mut state_lock = peer_state.lock().unwrap();
  95                         macro_rules! check_set_flag {
  96                                 ($recvd_flag: ident, $msg: expr) => { {
  97                                         if state_lock.$recvd_flag {
  98                                                 state_lock.fail_reason = AddressState::ProtocolViolation;
  99                                                 state_lock.msg = (format!("due to dup {}", $msg), true);
 100                                                 state_lock.$recvd_flag = false;
 101                                                 return future::err(());
 102                                         }
 103                                         state_lock.$recvd_flag = true;
 104                                 } }
 105                         }
 106                         state_lock.fail_reason = AddressState::TimeoutDuringRequest;
 107                         match msg {
 108                                 NetworkMessage::Version(ver) => {
 109                                         if ver.start_height < 0 || ver.start_height as u64 > state_lock.request.0 + 1008*2 {
 110                                                 state_lock.fail_reason = AddressState::HighBlockCount;
 111                                                 return future::err(());
 112                                         }
 113                                         let safe_ua = ver.user_agent.replace(|c: char| !c.is_ascii() || c < ' ' || c > '~', "");
 114                                         if (ver.start_height as u64) < state_lock.request.0 {
 115                                                 state_lock.msg = (format!("({} < {})", ver.start_height, state_lock.request.0), true);
 116                                                 state_lock.fail_reason = AddressState::LowBlockCount;
 117                                                 return future::err(());
 118                                         }
 119                                         let min_version = store.get_u64(U64Setting::MinProtocolVersion);
 120                                         if (ver.version as u64) < min_version {
 121                                                 state_lock.msg = (format!("({} < {})", ver.version, min_version), true);
 122                                                 state_lock.fail_reason = AddressState::LowVersion;
 123                                                 return future::err(());
 124                                         }
 125                                         if ver.services & (1 | (1 << 10)) == 0 {
 126                                                 state_lock.msg = (format!("({}: services {:x})", safe_ua, ver.services), true);
 127                                                 state_lock.fail_reason = AddressState::NotFullNode;
 128                                                 return future::err(());
 129                                         }
 130                                         if !store.get_regex(RegexSetting::SubverRegex).is_match(&ver.user_agent) {
 131                                                 state_lock.msg = (format!("subver {}", safe_ua), true);
 132                                                 state_lock.fail_reason = AddressState::BadVersion;
 133                                                 return future::err(());
 134                                         }
 135                                         check_set_flag!(recvd_version, "version");
 136                                         state_lock.node_services = ver.services;
 137                                         state_lock.msg = (format!("(subver: {})", safe_ua), false);
 138                                         if let Err(_) = write.try_send(NetworkMessage::Verack) {
 139                                                 return future::err(());
 140                                         }
 141                                 },
 142                                 NetworkMessage::Verack => {
 143                                         check_set_flag!(recvd_verack, "verack");
 144                                         if let Err(_) = write.try_send(NetworkMessage::Ping(state_lock.pong_nonce)) {
 145                                                 return future::err(());
 146                                         }
 147                                 },
 148                                 NetworkMessage::Ping(v) => {
 149                                         if let Err(_) = write.try_send(NetworkMessage::Pong(v)) {
 150                                                 return future::err(())
 151                                         }
 152                                 },
 153                                 NetworkMessage::Pong(v) => {
 154                                         if v != state_lock.pong_nonce {
 155                                                 state_lock.fail_reason = AddressState::ProtocolViolation;
 156                                                 state_lock.msg = ("due to invalid pong nonce".to_string(), true);
 157                                                 return future::err(());
 158                                         }
 159                                         check_set_flag!(recvd_pong, "pong");
 160                                         if let Err(_) = write.try_send(NetworkMessage::GetAddr) {
 161                                                 return future::err(());
 162                                         }
 163                                 },
 164                                 NetworkMessage::Addr(addrs) => {
 165                                         if addrs.len() > 1000 {
 166                                                 state_lock.fail_reason = AddressState::ProtocolViolation;
 167                                                 state_lock.msg = (format!("due to oversized addr: {}", addrs.len()), true);
 168                                                 state_lock.recvd_addrs = false;
 169                                                 return future::err(());
 170                                         }
 171                                         if addrs.len() > 10 {
 172                                                 if !state_lock.recvd_addrs {
 173                                                         if let Err(_) = write.try_send(NetworkMessage::GetData(vec![Inventory {
 174                                                                 inv_type: InvType::WitnessBlock,
 175                                                                 hash: state_lock.request.1,
 176                                                         }])) {
 177                                                                 return future::err(());
 178                                                         }
 179                                                 }
 180                                                 state_lock.recvd_addrs = true;
 181                                         }
 182                                         unsafe { DATA_STORE.as_ref().unwrap() }.add_fresh_nodes(&addrs);
 183                                 },
 184                                 NetworkMessage::Block(block) => {
 185                                         if block != state_lock.request.2 {
 186                                                 state_lock.fail_reason = AddressState::ProtocolViolation;
 187                                                 state_lock.msg = ("due to bad block".to_string(), true);
 188                                                 return future::err(());
 189                                         }
 190                                         check_set_flag!(recvd_block, "block");
 191                                         return future::err(());
 192                                 },
 193                                 NetworkMessage::Inv(invs) => {
 194                                         for inv in invs {
 195                                                 if inv.inv_type == InvType::Transaction {
 196                                                         state_lock.fail_reason = AddressState::EvilNode;
 197                                                         state_lock.msg = ("due to unrequested inv tx".to_string(), true);
 198                                                         return future::err(());
 199                                                 }
 200                                         }
 201                                 },
 202                                 NetworkMessage::Tx(_) => {
 203                                         state_lock.fail_reason = AddressState::EvilNode;
 204                                         state_lock.msg = ("due to unrequested transaction".to_string(), true);
 205                                         return future::err(());
 206                                 },
 207                                 _ => {},
 208                         }
 209                         future::ok(())
 210                 }).then(|_| {
 211                         future::err(())
 212                 })
 213         }).then(move |_: Result<(), ()>| {
 214                 let printer = unsafe { PRINTER.as_ref().unwrap() };
 215                 let store = unsafe { DATA_STORE.as_ref().unwrap() };
 216                 printer.set_stat(Stat::ConnectionClosed);
 217
 218                 let mut state_lock = final_peer_state.lock().unwrap();
 219                 if state_lock.recvd_version && state_lock.recvd_verack && state_lock.recvd_pong &&
 220                                 state_lock.recvd_addrs && state_lock.recvd_block {
 221                         let old_state = store.set_node_state(node, AddressState::Good, state_lock.node_services);
 222                         if manual || (old_state != AddressState::Good && state_lock.msg.0 != "") {
 223                                 printer.add_line(format!("Updating {} from {} to Good {}", node, old_state.to_str(), &state_lock.msg.0), state_lock.msg.1);
 224                         }
 225                 } else {
 226                         assert!(state_lock.fail_reason != AddressState::Good);
 227                         if state_lock.fail_reason == AddressState::TimeoutDuringRequest && state_lock.recvd_version && state_lock.recvd_verack {
 228                                 if !state_lock.recvd_pong {
 229                                         state_lock.fail_reason = AddressState::TimeoutAwaitingPong;
 230                                 } else if !state_lock.recvd_addrs {
 231                                         state_lock.fail_reason = AddressState::TimeoutAwaitingAddr;
 232                                 } else if !state_lock.recvd_block {
 233                                         state_lock.fail_reason = AddressState::TimeoutAwaitingBlock;
 234                                 }
 235                         }
 236                         let old_state = store.set_node_state(node, state_lock.fail_reason, 0);
 237                         if (manual || old_state != state_lock.fail_reason) && state_lock.fail_reason == AddressState::TimeoutDuringRequest {
 238                                 printer.add_line(format!("Updating {} from {} to Timeout During Request (ver: {}, vack: {})",
 239                                         node, old_state.to_str(), state_lock.recvd_version, state_lock.recvd_verack), true);
 240                         } else if manual || (old_state != state_lock.fail_reason && state_lock.msg.0 != "" && state_lock.msg.1) {
 241                                 printer.add_line(format!("Updating {} from {} to {} {}", node, old_state.to_str(), state_lock.fail_reason.to_str(), &state_lock.msg.0), state_lock.msg.1);
 242                         }
 243                 }
 244                 future::ok(())
 245         }));
 246 }
 247
 248 fn poll_dnsseeds() {
 249         tokio::spawn(future::lazy(|| {
 250                 let printer = unsafe { PRINTER.as_ref().unwrap() };
 251                 let store = unsafe { DATA_STORE.as_ref().unwrap() };
 252
 253                 let mut new_addrs = 0;
 254                 for seed in ["seed.bitcoin.sipa.be", "dnsseed.bitcoin.dashjr.org", "seed.bitcoinstats.com", "seed.bitcoin.jonasschnelli.ch", "seed.btc.petertodd.org", "seed.bitcoin.sprovoost.nl", "dnsseed.emzy.de"].iter() {
 255                         new_addrs += store.add_fresh_addrs((*seed, 8333u16).to_socket_addrs().unwrap_or(Vec::new().into_iter()));
 256                         new_addrs += store.add_fresh_addrs((("x9.".to_string() + seed).as_str(), 8333u16).to_socket_addrs().unwrap_or(Vec::new().into_iter()));
 257                 }
 258                 printer.add_line(format!("Added {} new addresses from other DNS seeds", new_addrs), false);
 259                 Delay::new(Instant::now() + Duration::from_secs(60)).then(|_| {
 260                         let store = unsafe { DATA_STORE.as_ref().unwrap() };
 261                         let dns_future = store.write_dns();
 262                         store.save_data().join(dns_future).then(|_| {
 263                                 if !START_SHUTDOWN.load(Ordering::Relaxed) {
 264                                         poll_dnsseeds();
 265                                 }
 266                                 future::ok(())
 267                         })
 268                 })
 269         }));
 270 }
 271
 272 fn scan_net() {
 273         tokio::spawn(future::lazy(|| {
 274                 let printer = unsafe { PRINTER.as_ref().unwrap() };
 275                 let store = unsafe { DATA_STORE.as_ref().unwrap() };
 276
 277                 let mut scan_nodes = store.get_next_scan_nodes();
 278                 printer.add_line(format!("Got {} addresses to scan", scan_nodes.len()), false);
 279                 let per_iter_time = Duration::from_millis(1000 / store.get_u64(U64Setting::ConnsPerSec));
 280                 let start_time = Instant::now();
 281                 let mut iter_time = start_time;
 282
 283                 for node in scan_nodes.drain(..) {
 284                         scan_node(iter_time, node, false);
 285                         iter_time += per_iter_time;
 286                 }
 287                 Delay::new(cmp::max(iter_time, start_time + Duration::from_secs(1))).then(|_| {
 288                         if !START_SHUTDOWN.load(Ordering::Relaxed) {
 289                                 scan_net();
 290                         }
 291                         future::ok(())
 292                 })
 293         }));
 294 }
 295
 296 fn make_trusted_conn(trusted_sockaddr: SocketAddr) {
 297         let printer = unsafe { PRINTER.as_ref().unwrap() };
 298         let trusted_peer = Peer::new(trusted_sockaddr.clone(), Duration::from_secs(600), printer);
 299         tokio::spawn(trusted_peer.and_then(move |(mut trusted_write, trusted_read)| {
 300                 printer.add_line("Connected to local peer".to_string(), false);
 301                 let mut starting_height = 0;
 302                 TimeoutStream::new_persistent(trusted_read, Duration::from_secs(600)).map_err(|_| { () }).for_each(move |msg| {
 303                         if START_SHUTDOWN.load(Ordering::Relaxed) {
 304                                 return future::err(());
 305                         }
 306                         match msg {
 307                                 NetworkMessage::Version(ver) => {
 308                                         if let Err(_) = trusted_write.try_send(NetworkMessage::Verack) {
 309                                                 return future::err(())
 310                                         }
 311                                         starting_height = ver.start_height;
 312                                 },
 313                                 NetworkMessage::Verack => {
 314                                         if let Err(_) = trusted_write.try_send(NetworkMessage::SendHeaders) {
 315                                                 return future::err(());
 316                                         }
 317                                         if let Err(_) = trusted_write.try_send(NetworkMessage::GetHeaders(GetHeadersMessage {
 318                                                 version: 70015,
 319                                                 locator_hashes: vec![unsafe { HIGHEST_HEADER.as_ref().unwrap() }.lock().unwrap().0.clone()],
 320                                                 stop_hash: Default::default(),
 321                                         })) {
 322                                                 return future::err(());
 323                                         }
 324                                         if let Err(_) = trusted_write.try_send(NetworkMessage::GetAddr) {
 325                                                 return future::err(());
 326                                         }
 327                                 },
 328                                 NetworkMessage::Addr(addrs) => {
 329                                         unsafe { DATA_STORE.as_ref().unwrap() }.add_fresh_nodes(&addrs);
 330                                 },
 331                                 NetworkMessage::Headers(headers) => {
 332                                         if headers.is_empty() {
 333                                                 return future::ok(());
 334                                         }
 335                                         let mut header_map = unsafe { HEADER_MAP.as_ref().unwrap() }.lock().unwrap();
 336                                         let mut height_map = unsafe { HEIGHT_MAP.as_ref().unwrap() }.lock().unwrap();
 337
 338                                         if let Some(height) = header_map.get(&headers[0].prev_blockhash).cloned() {
 339                                                 for i in 0..headers.len() {
 340                                                         let hash = headers[i].bitcoin_hash();
 341                                                         if i < headers.len() - 1 && headers[i + 1].prev_blockhash != hash {
 342                                                                 return future::err(());
 343                                                         }
 344                                                         header_map.insert(headers[i].bitcoin_hash(), height + 1 + (i as u64));
 345                                                         height_map.insert(height + 1 + (i as u64), headers[i].bitcoin_hash());
 346                                                 }
 347
 348                                                 let top_height = height + headers.len() as u64;
 349                                                 *unsafe { HIGHEST_HEADER.as_ref().unwrap() }.lock().unwrap()
 350                                                         = (headers.last().unwrap().bitcoin_hash(), top_height);
 351                                                 printer.set_stat(printer::Stat::HeaderCount(top_height));
 352
 353                                                 if top_height >= starting_height as u64 {
 354                                                         if let Err(_) = trusted_write.try_send(NetworkMessage::GetData(vec![Inventory {
 355                                                                 inv_type: InvType::WitnessBlock,
 356                                                                 hash: height_map.get(&(top_height - 216)).unwrap().clone(),
 357                                                         }])) {
 358                                                                 return future::err(());
 359                                                         }
 360                                                 }
 361                                         } else {
 362                                                 // Wat? Lets start again...
 363                                                 printer.add_line("Got unconnected headers message from local trusted peer".to_string(), true);
 364                                         }
 365                                         if let Err(_) = trusted_write.try_send(NetworkMessage::GetHeaders(GetHeadersMessage {
 366                                                 version: 70015,
 367                                                 locator_hashes: vec![unsafe { HIGHEST_HEADER.as_ref().unwrap() }.lock().unwrap().0.clone()],
 368                                                 stop_hash: Default::default(),
 369                                         })) {
 370                                                 return future::err(())
 371                                         }
 372                                 },
 373                                 NetworkMessage::Block(block) => {
 374                                         let hash = block.header.bitcoin_hash();
 375                                         let header_map = unsafe { HEADER_MAP.as_ref().unwrap() }.lock().unwrap();
 376                                         let height = *header_map.get(&hash).expect("Got loose block from trusted peer we coulnd't have requested");
 377                                         if height == unsafe { HIGHEST_HEADER.as_ref().unwrap() }.lock().unwrap().1 - 216 {
 378                                                 *unsafe { REQUEST_BLOCK.as_ref().unwrap() }.lock().unwrap() = Arc::new((height, hash, block));
 379                                                 if !SCANNING.swap(true, Ordering::SeqCst) {
 380                                                         scan_net();
 381                                                         poll_dnsseeds();
 382                                                 }
 383                                         }
 384                                 },
 385                                 NetworkMessage::Ping(v) => {
 386                                         if let Err(_) = trusted_write.try_send(NetworkMessage::Pong(v)) {
 387                                                 return future::err(())
 388                                         }
 389                                 },
 390                                 _ => {},
 391                         }
 392                         future::ok(())
 393                 }).then(|_| {
 394                         future::err(())
 395                 })
 396         }).then(move |_: Result<(), ()>| {
 397                 if !START_SHUTDOWN.load(Ordering::Relaxed) {
 398                         printer.add_line("Lost connection from trusted peer".to_string(), true);
 399                         make_trusted_conn(trusted_sockaddr);
 400                 }
 401                 future::ok(())
 402         }));
 403 }
 404
 405 fn main() {
 406         if env::args().len() != 3 {
 407                 println!("USAGE: dnsseed-rust datastore localPeerAddress");
 408                 return;
 409         }
 410
 411         unsafe { HEADER_MAP = Some(Box::new(Mutex::new(HashMap::with_capacity(600000)))) };
 412         unsafe { HEIGHT_MAP = Some(Box::new(Mutex::new(HashMap::with_capacity(600000)))) };
 413         unsafe { HEADER_MAP.as_ref().unwrap() }.lock().unwrap().insert(genesis_block(Network::Bitcoin).bitcoin_hash(), 0);
 414         unsafe { HEIGHT_MAP.as_ref().unwrap() }.lock().unwrap().insert(0, genesis_block(Network::Bitcoin).bitcoin_hash());
 415         unsafe { HIGHEST_HEADER = Some(Box::new(Mutex::new((genesis_block(Network::Bitcoin).bitcoin_hash(), 0)))) };
 416         unsafe { REQUEST_BLOCK = Some(Box::new(Mutex::new(Arc::new((0, genesis_block(Network::Bitcoin).bitcoin_hash(), genesis_block(Network::Bitcoin)))))) };
 417
 418         let trt = tokio::runtime::Builder::new()
 419                 .blocking_threads(2).core_threads(num_cpus::get().max(1) * 3)
 420                 .build().unwrap();
 421
 422         let _ = trt.block_on_all(future::lazy(|| {
 423                 let mut args = env::args();
 424                 args.next();
 425                 let path = args.next().unwrap();
 426                 let addr = args.next().unwrap();
 427
 428                 Store::new(path).and_then(move |store| {
 429                         unsafe { DATA_STORE = Some(Box::new(store)) };
 430                         let store = unsafe { DATA_STORE.as_ref().unwrap() };
 431                         unsafe { PRINTER = Some(Box::new(Printer::new(store))) };
 432
 433                         let trusted_sockaddr: SocketAddr = addr.parse().unwrap();
 434                         make_trusted_conn(trusted_sockaddr);
 435
 436                         reader::read(store, unsafe { PRINTER.as_ref().unwrap() });
 437
 438                         future::ok(())
 439                 }).or_else(|_| {
 440                         future::err(())
 441                 })
 442         }));
 443
 444         tokio::run(future::lazy(|| {
 445                 unsafe { DATA_STORE.as_ref().unwrap() }.save_data()
 446         }));
 447 }