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

   1 use std::{cmp, mem};
   2 use std::collections::{HashSet, HashMap, hash_map};
   3 use std::sync::{Arc, RwLock};
   4 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
   5 use std::time::{Duration, Instant};
   6 use std::io::{BufRead, BufReader};
   7
   8 use bitcoin::network::address::Address;
   9
  10 use rand::thread_rng;
  11 use rand::seq::{SliceRandom, IteratorRandom};
  12
  13 use tokio::prelude::*;
  14 use tokio::fs::File;
  15 use tokio::io::write_all;
  16
  17 use regex::Regex;
  18
  19 use crate::bgp_client::BGPClient;
  20
  21 pub const SECS_PER_SCAN_RESULTS: u64 = 15;
  22
  23 #[derive(Clone, Copy, Hash, PartialEq, Eq)]
  24 pub enum AddressState {
  25         Untested,
  26         LowBlockCount,
  27         HighBlockCount,
  28         LowVersion,
  29         BadVersion,
  30         NotFullNode,
  31         ProtocolViolation,
  32         Timeout,
  33         TimeoutDuringRequest,
  34         TimeoutAwaitingPong,
  35         TimeoutAwaitingAddr,
  36         TimeoutAwaitingBlock,
  37         Good,
  38         WasGood,
  39         EvilNode,
  40 }
  41
  42 impl AddressState {
  43         pub fn from_num(num: u8) -> Option<AddressState> {
  44                 match num {
  45                         0x0 => Some(AddressState::Untested),
  46                         0x1 => Some(AddressState::LowBlockCount),
  47                         0x2 => Some(AddressState::HighBlockCount),
  48                         0x3 => Some(AddressState::LowVersion),
  49                         0x4 => Some(AddressState::BadVersion),
  50                         0x5 => Some(AddressState::NotFullNode),
  51                         0x6 => Some(AddressState::ProtocolViolation),
  52                         0x7 => Some(AddressState::Timeout),
  53                         0x8 => Some(AddressState::TimeoutDuringRequest),
  54                         0x9 => Some(AddressState::TimeoutAwaitingPong),
  55                         0xa => Some(AddressState::TimeoutAwaitingAddr),
  56                         0xb => Some(AddressState::TimeoutAwaitingBlock),
  57                         0xc => Some(AddressState::Good),
  58                         0xd => Some(AddressState::WasGood),
  59                         0xe => Some(AddressState::EvilNode),
  60                         _   => None,
  61                 }
  62         }
  63
  64         pub fn to_num(&self) -> u8 {
  65                 match *self {
  66                         AddressState::Untested => 0,
  67                         AddressState::LowBlockCount => 1,
  68                         AddressState::HighBlockCount => 2,
  69                         AddressState::LowVersion => 3,
  70                         AddressState::BadVersion => 4,
  71                         AddressState::NotFullNode => 5,
  72                         AddressState::ProtocolViolation => 6,
  73                         AddressState::Timeout => 7,
  74                         AddressState::TimeoutDuringRequest => 8,
  75                         AddressState::TimeoutAwaitingPong => 9,
  76                         AddressState::TimeoutAwaitingAddr => 10,
  77                         AddressState::TimeoutAwaitingBlock => 11,
  78                         AddressState::Good => 12,
  79                         AddressState::WasGood => 13,
  80                         AddressState::EvilNode => 14,
  81                 }
  82         }
  83
  84         pub fn to_str(&self) -> &'static str {
  85                 match *self {
  86                         AddressState::Untested => "Untested",
  87                         AddressState::LowBlockCount => "Low Block Count",
  88                         AddressState::HighBlockCount => "High Block Count",
  89                         AddressState::LowVersion => "Low Version",
  90                         AddressState::BadVersion => "Bad Version",
  91                         AddressState::NotFullNode => "Not Full Node",
  92                         AddressState::ProtocolViolation => "Protocol Violation",
  93                         AddressState::Timeout => "Timeout",
  94                         AddressState::TimeoutDuringRequest => "Timeout During Request",
  95                         AddressState::TimeoutAwaitingPong => "Timeout Awaiting Pong",
  96                         AddressState::TimeoutAwaitingAddr => "Timeout Awaiting Addr",
  97                         AddressState::TimeoutAwaitingBlock => "Timeout Awaiting Block",
  98                         AddressState::Good => "Good",
  99                         AddressState::WasGood => "Was Good",
 100                         AddressState::EvilNode => "Evil Node",
 101                 }
 102         }
 103
 104         pub const fn get_count() -> u8 {
 105                 15
 106         }
 107 }
 108
 109 #[derive(Hash, PartialEq, Eq)]
 110 pub enum U64Setting {
 111         RunTimeout,
 112         WasGoodTimeout,
 113         RescanInterval(AddressState),
 114         MinProtocolVersion,
 115 }
 116
 117 #[derive(Hash, PartialEq, Eq)]
 118 pub enum RegexSetting {
 119         SubverRegex,
 120 }
 121
 122 struct Node {
 123         last_update: Instant,
 124         last_good: Instant, // Ignored unless state is Good or WasGood
 125         last_services: u64,
 126         state: AddressState,
 127 }
 128
 129 /// Essentially SocketAddr but without a traffic class or scope
 130 #[derive(Clone, PartialEq, Eq, Hash)]
 131 enum SockAddr {
 132         V4(SocketAddrV4),
 133         V6((Ipv6Addr, u16)),
 134 }
 135 impl From<SocketAddr> for SockAddr {
 136         fn from(addr: SocketAddr) -> SockAddr {
 137                 match addr {
 138                         SocketAddr::V4(sa) => SockAddr::V4(sa),
 139                         SocketAddr::V6(sa) => SockAddr::V6((sa.ip().clone(), sa.port())),
 140                 }
 141         }
 142 }
 143 impl Into<SocketAddr> for &SockAddr {
 144         fn into(self) -> SocketAddr {
 145                 match self {
 146                         &SockAddr::V4(sa) => SocketAddr::V4(sa),
 147                         &SockAddr::V6(sa) => SocketAddr::V6(SocketAddrV6::new(sa.0, sa.1, 0, 0))
 148                 }
 149         }
 150 }
 151 impl ToString for SockAddr {
 152         fn to_string(&self) -> String {
 153                 let sa: SocketAddr = self.into();
 154                 sa.to_string()
 155         }
 156 }
 157 impl SockAddr {
 158         pub fn port(&self) -> u16 {
 159                 match *self {
 160                         SockAddr::V4(sa) => sa.port(),
 161                         SockAddr::V6((_, port)) => port,
 162                 }
 163         }
 164         pub fn ip(&self) -> IpAddr {
 165                 match *self {
 166                         SockAddr::V4(sa) => IpAddr::V4(sa.ip().clone()),
 167                         SockAddr::V6((ip, _)) => IpAddr::V6(ip),
 168                 }
 169         }
 170 }
 171
 172 struct Nodes {
 173         good_node_services: [HashSet<SockAddr>; 64],
 174         nodes_to_state: HashMap<SockAddr, Node>,
 175         state_next_scan: Vec<Vec<(Instant, SockAddr)>>,
 176 }
 177 struct NodesMutRef<'a> {
 178         good_node_services: &'a mut [HashSet<SockAddr>; 64],
 179         nodes_to_state: &'a mut HashMap<SockAddr, Node>,
 180         state_next_scan: &'a mut Vec<Vec<(Instant, SockAddr)>>,
 181 }
 182
 183 impl Nodes {
 184         fn borrow_mut<'a>(&'a mut self) -> NodesMutRef<'a> {
 185                 NodesMutRef {
 186                         good_node_services: &mut self.good_node_services,
 187                         nodes_to_state: &mut self.nodes_to_state,
 188                         state_next_scan: &mut self.state_next_scan,
 189                 }
 190         }
 191 }
 192
 193 pub struct Store {
 194         u64_settings: RwLock<HashMap<U64Setting, u64>>,
 195         subver_regex: RwLock<Arc<Regex>>,
 196         nodes: RwLock<Nodes>,
 197         store: String,
 198 }
 199
 200 impl Store {
 201         pub fn new(store: String) -> impl Future<Item=Store, Error=()> {
 202                 let settings_future = File::open(store.clone() + "/settings").and_then(|f| {
 203                         let mut l = BufReader::new(f).lines();
 204                         macro_rules! try_read {
 205                                 ($lines: expr, $ty: ty) => { {
 206                                         match $lines.next() {
 207                                                 Some(line) => match line {
 208                                                         Ok(line) => match line.parse::<$ty>() {
 209                                                                 Ok(res) => res,
 210                                                                 Err(e) => return future::err(std::io::Error::new(std::io::ErrorKind::InvalidData, e)),
 211                                                         },
 212                                                         Err(e) => return future::err(e),
 213                                                 },
 214                                                 None => return future::err(std::io::Error::new(std::io::ErrorKind::UnexpectedEof, "")),
 215                                         }
 216                                 } }
 217                         }
 218                         let mut u64s = HashMap::with_capacity(AddressState::get_count() as usize + 4);
 219                         u64s.insert(U64Setting::RunTimeout, try_read!(l, u64));
 220                         u64s.insert(U64Setting::WasGoodTimeout, try_read!(l, u64));
 221                         u64s.insert(U64Setting::MinProtocolVersion, try_read!(l, u64));
 222                         u64s.insert(U64Setting::RescanInterval(AddressState::Untested), try_read!(l, u64));
 223                         u64s.insert(U64Setting::RescanInterval(AddressState::LowBlockCount), try_read!(l, u64));
 224                         u64s.insert(U64Setting::RescanInterval(AddressState::HighBlockCount), try_read!(l, u64));
 225                         u64s.insert(U64Setting::RescanInterval(AddressState::LowVersion), try_read!(l, u64));
 226                         u64s.insert(U64Setting::RescanInterval(AddressState::BadVersion), try_read!(l, u64));
 227                         u64s.insert(U64Setting::RescanInterval(AddressState::NotFullNode), try_read!(l, u64));
 228                         u64s.insert(U64Setting::RescanInterval(AddressState::ProtocolViolation), try_read!(l, u64));
 229                         u64s.insert(U64Setting::RescanInterval(AddressState::Timeout), try_read!(l, u64));
 230                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutDuringRequest), try_read!(l, u64));
 231                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingPong), try_read!(l, u64));
 232                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingAddr), try_read!(l, u64));
 233                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingBlock), try_read!(l, u64));
 234                         u64s.insert(U64Setting::RescanInterval(AddressState::Good), try_read!(l, u64));
 235                         u64s.insert(U64Setting::RescanInterval(AddressState::WasGood), try_read!(l, u64));
 236                         u64s.insert(U64Setting::RescanInterval(AddressState::EvilNode), try_read!(l, u64));
 237                         future::ok((u64s, try_read!(l, Regex)))
 238                 }).or_else(|_| -> future::FutureResult<(HashMap<U64Setting, u64>, Regex), ()> {
 239                         let mut u64s = HashMap::with_capacity(15);
 240                         u64s.insert(U64Setting::RunTimeout, 120);
 241                         u64s.insert(U64Setting::WasGoodTimeout, 21600);
 242                         u64s.insert(U64Setting::RescanInterval(AddressState::Untested), 1);
 243                         u64s.insert(U64Setting::RescanInterval(AddressState::LowBlockCount), 3600);
 244                         u64s.insert(U64Setting::RescanInterval(AddressState::HighBlockCount), 7200);
 245                         u64s.insert(U64Setting::RescanInterval(AddressState::LowVersion), 21600);
 246                         u64s.insert(U64Setting::RescanInterval(AddressState::BadVersion), 21600);
 247                         u64s.insert(U64Setting::RescanInterval(AddressState::NotFullNode), 86400);
 248                         u64s.insert(U64Setting::RescanInterval(AddressState::ProtocolViolation), 86400);
 249                         u64s.insert(U64Setting::RescanInterval(AddressState::Timeout), 86400);
 250                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutDuringRequest), 21600);
 251                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingPong), 3600);
 252                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingAddr), 1800);
 253                         u64s.insert(U64Setting::RescanInterval(AddressState::TimeoutAwaitingBlock), 3600);
 254                         u64s.insert(U64Setting::RescanInterval(AddressState::Good), 1800);
 255                         u64s.insert(U64Setting::RescanInterval(AddressState::WasGood), 1800);
 256                         u64s.insert(U64Setting::RescanInterval(AddressState::EvilNode), 315360000);
 257                         u64s.insert(U64Setting::MinProtocolVersion, 70002);
 258                         future::ok((u64s, Regex::new(".*").unwrap()))
 259                 });
 260
 261                 macro_rules! nodes_uninitd {
 262                         () => { {
 263                                 let mut state_vecs = Vec::with_capacity(AddressState::get_count() as usize);
 264                                 for _ in 0..AddressState::get_count() {
 265                                         state_vecs.push(Vec::new());
 266                                 }
 267                                 let good_node_services = [HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new(), HashSet::new()];
 268                                 Nodes {
 269                                         good_node_services,
 270                                         nodes_to_state: HashMap::new(),
 271                                         state_next_scan: state_vecs,
 272                                 }
 273                         } }
 274                 }
 275
 276                 let nodes_future = File::open(store.clone() + "/nodes").and_then(|f| {
 277                         let start_time = Instant::now() - Duration::from_secs(60 * 60 * 24);
 278                         let mut res = nodes_uninitd!();
 279                         let l = BufReader::new(f).lines();
 280                         for line_res in l {
 281                                 let line = match line_res {
 282                                         Ok(l) => l,
 283                                         Err(_) => return future::ok(res),
 284                                 };
 285                                 let mut line_iter = line.split(',');
 286                                 macro_rules! try_read {
 287                                         ($lines: expr, $ty: ty) => { {
 288                                                 match $lines.next() {
 289                                                         Some(line) => match line.parse::<$ty>() {
 290                                                                 Ok(res) => res,
 291                                                                 Err(_) => return future::ok(res),
 292                                                         },
 293                                                         None => return future::ok(res),
 294                                                 }
 295                                         } }
 296                                 }
 297                                 let sockaddr = try_read!(line_iter, SocketAddr);
 298                                 let state = try_read!(line_iter, u8);
 299                                 let last_services = try_read!(line_iter, u64);
 300                                 let node = Node {
 301                                         state: match AddressState::from_num(state) {
 302                                                 Some(v) => v,
 303                                                 None => return future::ok(res),
 304                                         },
 305                                         last_services,
 306                                         last_update: Instant::now(),
 307                                         last_good: Instant::now(),
 308                                 };
 309                                 if node.state == AddressState::Good {
 310                                         for i in 0..64 {
 311                                                 if node.last_services & (1 << i) != 0 {
 312                                                         res.good_node_services[i].insert(sockaddr.into());
 313                                                 }
 314                                         }
 315                                 }
 316                                 res.state_next_scan[node.state.to_num() as usize].push((start_time, sockaddr.into()));
 317                                 res.nodes_to_state.insert(sockaddr.into(), node);
 318                         }
 319                         future::ok(res)
 320                 }).or_else(|_| -> future::FutureResult<Nodes, ()> {
 321                         future::ok(nodes_uninitd!())
 322                 });
 323                 settings_future.join(nodes_future).and_then(move |((u64_settings, regex), nodes)| {
 324                         future::ok(Store {
 325                                 u64_settings: RwLock::new(u64_settings),
 326                                 subver_regex: RwLock::new(Arc::new(regex)),
 327                                 nodes: RwLock::new(nodes),
 328                                 store,
 329                         })
 330                 })
 331         }
 332
 333         pub fn get_u64(&self, setting: U64Setting) -> u64 {
 334                 *self.u64_settings.read().unwrap().get(&setting).unwrap()
 335         }
 336
 337         pub fn set_u64(&self, setting: U64Setting, value: u64) {
 338                 *self.u64_settings.write().unwrap().get_mut(&setting).unwrap() = value;
 339         }
 340
 341         pub fn get_node_count(&self, state: AddressState) -> usize {
 342                 self.nodes.read().unwrap().state_next_scan[state.to_num() as usize].len()
 343         }
 344
 345         pub fn get_regex(&self, _setting: RegexSetting) -> Arc<Regex> {
 346                 Arc::clone(&*self.subver_regex.read().unwrap())
 347         }
 348
 349         pub fn set_regex(&self, _setting: RegexSetting, value: Regex) {
 350                 *self.subver_regex.write().unwrap() = Arc::new(value);
 351         }
 352
 353         pub fn add_fresh_addrs<I: Iterator<Item=SocketAddr>>(&self, addresses: I) -> u64 {
 354                 let mut res = 0;
 355                 let mut nodes = self.nodes.write().unwrap();
 356                 let cur_time = Instant::now();
 357                 for addr in addresses {
 358                         match nodes.nodes_to_state.entry(addr.into()) {
 359                                 hash_map::Entry::Vacant(e) => {
 360                                         e.insert(Node {
 361                                                 state: AddressState::Untested,
 362                                                 last_services: 0,
 363                                                 last_update: cur_time,
 364                                                 last_good: cur_time,
 365                                         });
 366                                         nodes.state_next_scan[AddressState::Untested.to_num() as usize].push((cur_time, addr.into()));
 367                                         res += 1;
 368                                 },
 369                                 hash_map::Entry::Occupied(_) => {},
 370                         }
 371                 }
 372                 res
 373         }
 374
 375         pub fn add_fresh_nodes(&self, addresses: &Vec<(u32, Address)>) {
 376                 self.add_fresh_addrs(addresses.iter().filter_map(|(_, addr)| {
 377                         match addr.socket_addr() {
 378                                 Ok(socketaddr) => Some(socketaddr),
 379                                 Err(_) => None, // TODO: Handle onions
 380                         }
 381                 }));
 382         }
 383
 384         pub fn set_node_state(&self, sockaddr: SocketAddr, state: AddressState, services: u64) -> AddressState {
 385                 let addr: SockAddr = sockaddr.into();
 386                 let now = Instant::now();
 387
 388                 let mut nodes_lock = self.nodes.write().unwrap();
 389                 let nodes = nodes_lock.borrow_mut();
 390
 391                 let state_ref = nodes.nodes_to_state.entry(addr.clone()).or_insert(Node {
 392                         state: AddressState::Untested,
 393                         last_services: 0,
 394                         last_update: now,
 395                         last_good: now,
 396                 });
 397                 let ret = state_ref.state;
 398                 if (state_ref.state == AddressState::Good || state_ref.state == AddressState::WasGood)
 399                                 && state != AddressState::Good
 400                                 && state_ref.last_good >= now - Duration::from_secs(self.get_u64(U64Setting::WasGoodTimeout)) {
 401                         state_ref.state = AddressState::WasGood;
 402                         for i in 0..64 {
 403                                 if state_ref.last_services & (1 << i) != 0 {
 404                                         nodes.good_node_services[i].remove(&addr);
 405                                 }
 406                         }
 407                         state_ref.last_services = 0;
 408                         nodes.state_next_scan[AddressState::WasGood.to_num() as usize].push((now, addr));
 409                 } else {
 410                         state_ref.state = state;
 411                         if state == AddressState::Good {
 412                                 for i in 0..64 {
 413                                         if services & (1 << i) != 0 && state_ref.last_services & (1 << i) == 0 {
 414                                                 nodes.good_node_services[i].insert(addr.clone());
 415                                         } else if services & (1 << i) == 0 && state_ref.last_services & (1 << i) != 0 {
 416                                                 nodes.good_node_services[i].remove(&addr);
 417                                         }
 418                                 }
 419                                 state_ref.last_services = services;
 420                                 state_ref.last_good = now;
 421                         }
 422                         nodes.state_next_scan[state.to_num() as usize].push((now, addr));
 423                 }
 424                 state_ref.last_update = now;
 425                 ret
 426         }
 427
 428         pub fn save_data(&'static self) -> impl Future<Item=(), Error=()> {
 429                 let settings_file = self.store.clone() + "/settings";
 430                 let settings_future = File::create(settings_file.clone() + ".tmp").and_then(move |f| {
 431                         let settings_string = format!("{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}",
 432                                 self.get_u64(U64Setting::RunTimeout),
 433                                 self.get_u64(U64Setting::WasGoodTimeout),
 434                                 self.get_u64(U64Setting::MinProtocolVersion),
 435                                 self.get_u64(U64Setting::RescanInterval(AddressState::Untested)),
 436                                 self.get_u64(U64Setting::RescanInterval(AddressState::LowBlockCount)),
 437                                 self.get_u64(U64Setting::RescanInterval(AddressState::HighBlockCount)),
 438                                 self.get_u64(U64Setting::RescanInterval(AddressState::LowVersion)),
 439                                 self.get_u64(U64Setting::RescanInterval(AddressState::BadVersion)),
 440                                 self.get_u64(U64Setting::RescanInterval(AddressState::NotFullNode)),
 441                                 self.get_u64(U64Setting::RescanInterval(AddressState::ProtocolViolation)),
 442                                 self.get_u64(U64Setting::RescanInterval(AddressState::Timeout)),
 443                                 self.get_u64(U64Setting::RescanInterval(AddressState::TimeoutDuringRequest)),
 444                                 self.get_u64(U64Setting::RescanInterval(AddressState::TimeoutAwaitingPong)),
 445                                 self.get_u64(U64Setting::RescanInterval(AddressState::TimeoutAwaitingAddr)),
 446                                 self.get_u64(U64Setting::RescanInterval(AddressState::TimeoutAwaitingBlock)),
 447                                 self.get_u64(U64Setting::RescanInterval(AddressState::Good)),
 448                                 self.get_u64(U64Setting::RescanInterval(AddressState::WasGood)),
 449                                 self.get_u64(U64Setting::RescanInterval(AddressState::EvilNode)),
 450                                 self.get_regex(RegexSetting::SubverRegex).as_str());
 451                         write_all(f, settings_string).and_then(|(mut f, _)| {
 452                                 f.poll_sync_all()
 453                         }).and_then(|_| {
 454                                 tokio::fs::rename(settings_file.clone() + ".tmp", settings_file)
 455                         })
 456                 });
 457
 458                 let nodes_file = self.store.clone() + "/nodes";
 459                 let nodes_future = File::create(nodes_file.clone() + ".tmp").and_then(move |f| {
 460                         let mut nodes_buff = String::new();
 461                         {
 462                                 let nodes = self.nodes.read().unwrap();
 463                                 nodes_buff.reserve(nodes.nodes_to_state.len() * 20);
 464                                 for (ref sockaddr, ref node) in nodes.nodes_to_state.iter() {
 465                                         nodes_buff += &sockaddr.to_string();
 466                                         nodes_buff += ",";
 467                                         nodes_buff += &node.state.to_num().to_string();
 468                                         nodes_buff += ",";
 469                                         nodes_buff += &node.last_services.to_string();
 470                                         nodes_buff += "\n";
 471                                 }
 472                         }
 473                         write_all(f, nodes_buff)
 474                 }).and_then(|(mut f, _)| {
 475                         f.poll_sync_all()
 476                 }).and_then(|_| {
 477                         tokio::fs::rename(nodes_file.clone() + ".tmp", nodes_file)
 478                 });
 479
 480                 settings_future.join(nodes_future).then(|_| { future::ok(()) })
 481         }
 482
 483         pub fn write_dns(&'static self, bgp_client: Arc<BGPClient>) -> impl Future<Item=(), Error=()> {
 484                 let dns_file = self.store.clone() + "/nodes.dump";
 485                 File::create(dns_file.clone() + ".tmp").and_then(move |f| {
 486                         let mut dns_buff = String::new();
 487                         {
 488                                 let mut rng = thread_rng();
 489                                 for i in &[1u64, 4, 5, 8, 9, 12, 13, 1024, 1025, 1028, 1029, 1032, 1033, 1036, 1037] {
 490                                         let mut tor_set: Vec<Ipv6Addr> = Vec::new();
 491                                         let mut v6_set: Vec<Ipv6Addr> = Vec::new();
 492                                         let mut v4_set: Vec<Ipv4Addr> = Vec::new();
 493                                         macro_rules! add_addr { ($addr: expr) => {
 494                                                 match $addr.ip() {
 495                                                         IpAddr::V4(v4addr) => v4_set.push(v4addr),
 496                                                         IpAddr::V6(v6addr) if v6addr.octets()[..6] == [0xFD,0x87,0xD8,0x7E,0xEB,0x43][..] => tor_set.push(v6addr),
 497                                                         IpAddr::V6(v6addr) => v6_set.push(v6addr),
 498                                                 }
 499                                         } }
 500                                         {
 501                                                 let nodes = self.nodes.read().unwrap();
 502                                                 if i.count_ones() == 1 {
 503                                                         for j in 0..64 {
 504                                                                 if i & (1 << j) != 0 {
 505                                                                         let set_ref = &nodes.good_node_services[j];
 506                                                                         for a in set_ref.iter().filter(|e| e.port() == 8333) {
 507                                                                                 add_addr!(a);
 508                                                                         }
 509                                                                         break;
 510                                                                 }
 511                                                         }
 512                                                 } else if i.count_ones() == 2 {
 513                                                         let mut first_set = None;
 514                                                         let mut second_set = None;
 515                                                         for j in 0..64 {
 516                                                                 if i & (1 << j) != 0 {
 517                                                                         if first_set == None {
 518                                                                                 first_set = Some(&nodes.good_node_services[j]);
 519                                                                         } else {
 520                                                                                 second_set = Some(&nodes.good_node_services[j]);
 521                                                                                 break;
 522                                                                         }
 523                                                                 }
 524                                                         }
 525                                                         for a in first_set.unwrap().intersection(&second_set.unwrap()).filter(|e| e.port() == 8333) {
 526                                                                 add_addr!(a);
 527                                                         }
 528                                                 } else {
 529                                                         //TODO: Could optimize this one a bit
 530                                                         let mut intersection;
 531                                                         let mut intersection_set_ref = None;
 532                                                         for j in 0..64 {
 533                                                                 if i & (1 << j) != 0 {
 534                                                                         if intersection_set_ref == None {
 535                                                                                 intersection_set_ref = Some(&nodes.good_node_services[j]);
 536                                                                         } else {
 537                                                                                 let new_intersection = intersection_set_ref.unwrap()
 538                                                                                         .intersection(&nodes.good_node_services[j]).map(|e| (*e).clone()).collect();
 539                                                                                 intersection = Some(new_intersection);
 540                                                                                 intersection_set_ref = Some(intersection.as_ref().unwrap());
 541                                                                         }
 542                                                                 }
 543                                                         }
 544                                                         for a in intersection_set_ref.unwrap().iter().filter(|e| e.port() == 8333) {
 545                                                                 add_addr!(a);
 546                                                         }
 547                                                 }
 548                                         }
 549                                         let mut asn_set = HashSet::with_capacity(cmp::max(v4_set.len(), v6_set.len()));
 550                                         asn_set.insert(0);
 551                                         for a in v4_set.iter().filter(|a| asn_set.insert(bgp_client.get_asn(IpAddr::V4(**a)))).choose_multiple(&mut rng, 21) {
 552                                                 dns_buff += &format!("x{:x}.dnsseed\tIN\tA\t{}\n", i, a);
 553                                         }
 554                                         asn_set.clear();
 555                                         asn_set.insert(0);
 556                                         for a in v6_set.iter().filter(|a| asn_set.insert(bgp_client.get_asn(IpAddr::V6(**a)))).choose_multiple(&mut rng, 10) {
 557                                                 dns_buff += &format!("x{:x}.dnsseed\tIN\tAAAA\t{}\n", i, a);
 558                                         }
 559                                         for a in tor_set.iter().choose_multiple(&mut rng, 2) {
 560                                                 dns_buff += &format!("x{:x}.dnsseed\tIN\tAAAA\t{}\n", i, a);
 561                                         }
 562                                 }
 563                         }
 564                         write_all(f, dns_buff)
 565                 }).and_then(|(mut f, _)| {
 566                         f.poll_sync_all()
 567                 }).and_then(|_| {
 568                         tokio::fs::rename(dns_file.clone() + ".tmp", dns_file)
 569                 }).then(|_| { future::ok(()) })
 570         }
 571
 572         pub fn get_next_scan_nodes(&self) -> Vec<SocketAddr> {
 573                 let mut res = Vec::with_capacity(128);
 574                 let cur_time = Instant::now();
 575
 576                 {
 577                         let mut nodes = self.nodes.write().unwrap();
 578                         for (idx, state_nodes) in nodes.state_next_scan.iter_mut().enumerate() {
 579                                 let rescan_interval = cmp::max(self.get_u64(U64Setting::RescanInterval(AddressState::from_num(idx as u8).unwrap())), 1);
 580                                 let cmp_time = cur_time - Duration::from_secs(rescan_interval);
 581                                 let split_point = cmp::min(SECS_PER_SCAN_RESULTS * state_nodes.len() as u64 / rescan_interval,
 582                                                 state_nodes.binary_search_by(|a| a.0.cmp(&cmp_time)).unwrap_or_else(|idx| idx) as u64);
 583                                 let mut new_nodes = state_nodes.split_off(split_point as usize);
 584                                 mem::swap(&mut new_nodes, state_nodes);
 585                                 for (_, node) in new_nodes.drain(..) {
 586                                         res.push((&node).into());
 587                                 }
 588                         }
 589                 }
 590                 res.shuffle(&mut thread_rng());
 591                 res
 592         }
 593 }