Examples with NATTraversalHandler com.biglybt.core.nat.NATTraversalHandler used on opensource projects

Example 1 with NATTraversalHandler

use of com.biglybt.core.nat.NATTraversalHandler in project BiglyBT by BiglySoftware.

the class PairingManagerTunnelHandler method start.

private void start() {
    synchronized (this) {
        if (started) {
            return;
        }
        started = true;
    }
    N_3072 = fromHex("FFFFFFFF FFFFFFFF C90FDAA2 2168C234 C4C6628B 80DC1CD1 29024E08" + "8A67CC74 020BBEA6 3B139B22 514A0879 8E3404DD EF9519B3 CD3A431B" + "302B0A6D F25F1437 4FE1356D 6D51C245 E485B576 625E7EC6 F44C42E9" + "A637ED6B 0BFF5CB6 F406B7ED EE386BFB 5A899FA5 AE9F2411 7C4B1FE6" + "49286651 ECE45B3D C2007CB8 A163BF05 98DA4836 1C55D39A 69163FA8" + "FD24CF5F 83655D23 DCA3AD96 1C62F356 208552BB 9ED52907 7096966D" + "670C354E 4ABC9804 F1746C08 CA18217C 32905E46 2E36CE3B E39E772C" + "180E8603 9B2783A2 EC07A28F B5C55DF0 6F4C52C9 DE2BCBF6 95581718" + "3995497C EA956AE5 15D22618 98FA0510 15728E5A 8AAAC42D AD33170D" + "04507A33 A85521AB DF1CBA64 ECFB8504 58DBEF0A 8AEA7157 5D060C7D" + "B3970F85 A6E1E4C7 ABF5AE8C DB0933D7 1E8C94E0 4A25619D CEE3D226" + "1AD2EE6B F12FFA06 D98A0864 D8760273 3EC86A64 521F2B18 177B200C" + "BBE11757 7A615D6C 770988C0 BAD946E2 08E24FA0 74E5AB31 43DB5BFC" + "E0FD108E 4B82D120 A93AD2CA FFFFFFFF FFFFFFFF");
    G_3072 = BigInteger.valueOf(5);
    try {
        PluginInterface dht_pi = core.getPluginManager().getPluginInterfaceByClass(DHTPlugin.class);
        if (dht_pi == null) {
            throw (new Exception("DHT Plugin not found"));
        }
        DHTPlugin dht_plugin = (DHTPlugin) dht_pi.getPlugin();
        if (!dht_plugin.isEnabled()) {
            throw (new Exception("DHT Plugin is disabled"));
        }
        DHT[] dhts = dht_plugin.getDHTs();
        List<DHTNATPuncher> punchers = new ArrayList<>();
        for (DHT dht : dhts) {
            int net = dht.getTransport().getNetwork();
            if (net == DHT.NW_AZ_MAIN) {
                DHTNATPuncher primary_puncher = dht.getNATPuncher();
                if (primary_puncher != null) {
                    punchers.add(primary_puncher);
                    nat_punchers_ipv4.add(primary_puncher);
                    for (int i = 1; i <= 2; i++) {
                        DHTNATPuncher puncher = primary_puncher.getSecondaryPuncher();
                        punchers.add(puncher);
                        nat_punchers_ipv4.add(puncher);
                    }
                }
            } else if (net == DHT.NW_AZ_MAIN_V6) {
            /*
					 * no point in this atm as we don't support v6 tunnels

					DHTNATPuncher puncher = dht.getNATPuncher();

					if ( puncher != null ){

						punchers.add( puncher );

						nat_punchers_ipv6.add( puncher );

						puncher = puncher.getSecondaryPuncher();

						punchers.add( puncher );

						nat_punchers_ipv6.add( puncher );
					}
					*/
            }
        }
        if (punchers.size() == 0) {
            throw (new Exception("No suitable DHT instances available"));
        }
        for (DHTNATPuncher p : punchers) {
            p.forceActive(true);
            p.addListener(new DHTNATPuncherListener() {

                @Override
                public void rendezvousChanged(DHTTransportContact rendezvous) {
                    System.out.println("active: " + rendezvous.getString());
                    synchronized (PairingManagerTunnelHandler.this) {
                        if (update_event == null) {
                            update_event = SimpleTimer.addEvent("PMT:defer", SystemTime.getOffsetTime(15 * 1000), new TimerEventPerformer() {

                                @Override
                                public void perform(TimerEvent event) {
                                    synchronized (PairingManagerTunnelHandler.this) {
                                        update_event = null;
                                    }
                                    System.out.println("    updating");
                                    manager.updateNeeded();
                                }
                            });
                        }
                    }
                }
            });
        }
        core.getNATTraverser().registerHandler(new NATTraversalHandler() {

            private final Map<Long, Object[]> server_map = new LinkedHashMap<Long, Object[]>(10, 0.75f, true) {

                @Override
                protected boolean removeEldestEntry(Map.Entry<Long, Object[]> eldest) {
                    return size() > 10;
                }
            };

            @Override
            public int getType() {
                return (NATTraverser.TRAVERSE_REASON_PAIR_TUNNEL);
            }

            @Override
            public String getName() {
                return ("Pairing Tunnel");
            }

            @Override
            public Map process(InetSocketAddress originator, Map data) {
                if (SRP_VERIFIER == null || !active) {
                    return (null);
                }
                boolean good_request = false;
                try {
                    Map result = new HashMap();
                    Long session = (Long) data.get("sid");
                    if (session == null) {
                        return (null);
                    }
                    InetAddress tunnel_originator;
                    try {
                        tunnel_originator = InetAddress.getByAddress((byte[]) data.get("origin"));
                    } catch (Throwable e) {
                        Debug.out("originator decode failed: " + data);
                        return (null);
                    }
                    System.out.println("PairManagerTunnelHander: incoming message - session=" + session + ", payload=" + data + " from " + tunnel_originator + " via " + originator);
                    SRP6Server server;
                    BigInteger B;
                    synchronized (server_map) {
                        Object[] entry = server_map.get(session);
                        if (entry == null) {
                            long diff = SystemTime.getMonotonousTime() - last_server_create_time;
                            if (diff < 5000) {
                                try {
                                    long sleep = 5000 - diff;
                                    System.out.println("Sleeping for " + sleep + " before starting srp");
                                    Thread.sleep(sleep);
                                } catch (Throwable e) {
                                }
                            }
                            server = new SRP6Server();
                            server.init(N_3072, G_3072, SRP_VERIFIER, new SHA256Digest(), RandomUtils.SECURE_RANDOM);
                            B = server.generateServerCredentials();
                            server_map.put(session, new Object[] { server, B });
                            last_server_create_time = SystemTime.getMonotonousTime();
                            total_servers++;
                        } else {
                            server = (SRP6Server) entry[0];
                            B = (BigInteger) entry[1];
                        }
                    }
                    Long op = (Long) data.get("op");
                    if (op == 1) {
                        result.put("op", 2);
                        result.put("s", SRP_SALT);
                        result.put("b", B.toByteArray());
                        good_request = true;
                        if (data.containsKey("test")) {
                            manager.recordRequest("SRP Test", originator.getAddress().getHostAddress(), true);
                        }
                    } else if (op == 3) {
                        boolean log_error = true;
                        try {
                            long diff = SystemTime.getMonotonousTime() - last_server_agree_time;
                            if (diff < 5000) {
                                try {
                                    long sleep = 5000 - diff;
                                    System.out.println("Sleeping for " + sleep + " before completing srp");
                                    Thread.sleep(sleep);
                                } catch (Throwable e) {
                                }
                            }
                            BigInteger A = new BigInteger((byte[]) data.get("a"));
                            BigInteger serverS = server.calculateSecret(A);
                            byte[] shared_secret = serverS.toByteArray();
                            Cipher decipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                            byte[] key = new byte[16];
                            System.arraycopy(shared_secret, 0, key, 0, 16);
                            SecretKeySpec secret = new SecretKeySpec(key, "AES");
                            decipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec((byte[]) data.get("enc_iv")));
                            byte[] dec = decipher.doFinal((byte[]) data.get("enc_data"));
                            String json_str = new String(dec, "UTF-8");
                            if (!json_str.startsWith("{")) {
                                log_error = false;
                                throw (new Exception("decode failed"));
                            }
                            JSONObject dec_json = (JSONObject) JSONUtils.decodeJSON(json_str);
                            String tunnel_url = (String) dec_json.get("url");
                            String service_id = new String((byte[]) data.get("service"), "UTF-8");
                            String endpoint_url = (String) dec_json.get("endpoint");
                            boolean ok = createTunnel(tunnel_originator, session, service_id, secret, tunnel_url, endpoint_url);
                            result.put("op", 4);
                            result.put("status", ok ? "ok" : "failed");
                            good_request = true;
                        } catch (Throwable e) {
                            result.put("op", 4);
                            result.put("status", "failed");
                            if (e instanceof BadPaddingException || e instanceof IllegalBlockSizeException) {
                                log_error = false;
                            }
                            if (log_error) {
                                e.printStackTrace();
                            }
                        } finally {
                            last_server_agree_time = SystemTime.getMonotonousTime();
                        }
                    }
                    return (result);
                } finally {
                    if (!good_request) {
                        manager.recordRequest("SRP", originator.getAddress().getHostAddress(), false);
                    }
                }
            }
        });
        SimpleTimer.addPeriodicEvent("pm:tunnel:stats", 30 * 1000, new TimerEventPerformer() {

            @Override
            public void perform(TimerEvent event) {
                synchronized (tunnels) {
                    if (tunnels.size() > 0) {
                        System.out.println("PairTunnels: " + tunnels.size());
                        for (PairManagerTunnel t : tunnels.values()) {
                            System.out.println("\t" + t.getString());
                        }
                    }
                }
            }
        });
    } catch (Throwable e) {
        Debug.out(e);
        init_fail = Debug.getNestedExceptionMessage(e);
        manager.updateSRPState();
    }
}