Finally fixed the bug that was haunting me for the last week.

core/src/main/java/ch/dissem/bitmessage/BitmessageContext.java

@@ -157,6 +157,7 @@ public class BitmessageContext {
                         .from(from)
                         .to(to)
                         .message(subject, message)
+                        .labels(messages().getLabels(Label.Type.SENT))
                         .build();
                 if (to.getPubkey() == null) {
                     tryToFindMatchingPubkey(to);

core/src/main/java/ch/dissem/bitmessage/DefaultMessageListener.java

@@ -90,6 +90,13 @@ class DefaultMessageListener implements NetworkHandler.MessageListener {
                 address = ctx.getAddressRepository().findContact(pubkey.getRipe());
             }
             if (address != null) {
+                updatePubkey(address, pubkey);
+            }
+        } catch (DecryptionFailedException ignore) {
+        }
+    }
+
+    private void updatePubkey(BitmessageAddress address, Pubkey pubkey){
         address.setPubkey(pubkey);
         LOG.info("Got pubkey for contact " + address);
         ctx.getAddressRepository().save(address);
@@ -108,9 +115,6 @@ class DefaultMessageListener implements NetworkHandler.MessageListener {
             ctx.getMessageRepository().save(msg);
         }
     }
-        } catch (DecryptionFailedException ignore) {
-        }
-    }
 
     protected void receive(ObjectMessage object, Msg msg) throws IOException {
         for (BitmessageAddress identity : ctx.getAddressRepository().getIdentities()) {
@@ -125,6 +129,7 @@ class DefaultMessageListener implements NetworkHandler.MessageListener {
                     msg.getPlaintext().setInventoryVector(object.getInventoryVector());
                     ctx.getMessageRepository().save(msg.getPlaintext());
                     listener.receive(msg.getPlaintext());
+                    updatePubkey(msg.getPlaintext().getFrom(), msg.getPlaintext().getFrom().getPubkey());
                 }
                 break;
             } catch (DecryptionFailedException ignore) {
@@ -148,6 +153,7 @@ class DefaultMessageListener implements NetworkHandler.MessageListener {
                     broadcast.getPlaintext().setInventoryVector(object.getInventoryVector());
                     ctx.getMessageRepository().save(broadcast.getPlaintext());
                     listener.receive(broadcast.getPlaintext());
+                    updatePubkey(broadcast.getPlaintext().getFrom(), broadcast.getPlaintext().getFrom().getPubkey());
                 }
             } catch (DecryptionFailedException ignore) {
             }

core/src/main/java/ch/dissem/bitmessage/entity/Inv.java

@@ -44,10 +44,10 @@ public class Inv implements MessagePayload {
     }
 
     @Override
-    public void write(OutputStream stream) throws IOException {
+    public void write(OutputStream out) throws IOException {
-        Encode.varInt(inventory.size(), stream);
+        Encode.varInt(inventory.size(), out);
         for (InventoryVector iv : inventory) {
-            iv.write(stream);
+            iv.write(out);
         }
     }
 

core/src/main/java/ch/dissem/bitmessage/entity/valueobject/InventoryVector.java

@@ -38,7 +38,6 @@ public class InventoryVector implements Streamable, Serializable {
         InventoryVector that = (InventoryVector) o;
 
         return Arrays.equals(hash, that.hash);
-
     }
 
     @Override

core/src/main/java/ch/dissem/bitmessage/factory/V3MessageFactory.java

@@ -44,6 +44,9 @@ class V3MessageFactory {
         findMagic(in);
         String command = getCommand(in);
         int length = (int) Decode.uint32(in);
+        if (length > 1600003) {
+            throw new NodeException("Payload of " + length + " bytes received, no more than 1600003 was expected.");
+        }
         byte[] checksum = Decode.bytes(in, 4);
 
         byte[] payloadBytes = Decode.bytes(in, length);
@@ -191,10 +194,10 @@ class V3MessageFactory {
 
     private static String getCommand(InputStream stream) throws IOException {
         byte[] bytes = new byte[12];
-        int end = -1;
+        int end = bytes.length;
         for (int i = 0; i < bytes.length; i++) {
             bytes[i] = (byte) stream.read();
-            if (end == -1) {
+            if (end == bytes.length) {
                 if (bytes[i] == 0) end = i;
             } else {
                 if (bytes[i] != 0) throw new IOException("'\\0' padding expected for command");

core/src/test/java/ch/dissem/bitmessage/entity/SerializationTest.java

@@ -17,6 +17,7 @@
 package ch.dissem.bitmessage.entity;
 
 import ch.dissem.bitmessage.entity.payload.*;
+import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
 import ch.dissem.bitmessage.entity.valueobject.Label;
 import ch.dissem.bitmessage.factory.Factory;
 import ch.dissem.bitmessage.utils.TestBase;
@@ -25,9 +26,11 @@ import org.junit.Test;
 
 import java.io.*;
 import java.lang.reflect.Field;
+import java.util.ArrayList;
 import java.util.Collections;
 
 import static ch.dissem.bitmessage.entity.Plaintext.Type.MSG;
+import static ch.dissem.bitmessage.utils.Singleton.security;
 import static org.junit.Assert.*;
 
 public class SerializationTest extends TestBase {
@@ -95,6 +98,23 @@ public class SerializationTest extends TestBase {
         assertEquals(p1, p2);
     }
 
+    @Test
+    public void ensureNetworkMessageIsSerializedAndDeserializedCorrectly() throws Exception {
+        ArrayList<InventoryVector> ivs = new ArrayList<>(50000);
+        for (int i = 0; i < 50000; i++) {
+            ivs.add(new InventoryVector(security().randomBytes(32)));
+        }
+
+        Inv inv = new Inv.Builder().inventory(ivs).build();
+        NetworkMessage before = new NetworkMessage(inv);
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        before.write(out);
+
+        NetworkMessage after = Factory.getNetworkMessage(3, new ByteArrayInputStream(out.toByteArray()));
+        Inv invAfter = (Inv) after.getPayload();
+        assertEquals(ivs, invAfter.getInventory());
+    }
+
     private void doTest(String resourceName, int version, Class<?> expectedPayloadType) throws IOException {
         byte[] data = TestUtils.getBytes(resourceName);
         InputStream in = new ByteArrayInputStream(data);

demo/src/main/java/ch/dissem/bitmessage/demo/Application.java

@@ -28,6 +28,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.UnsupportedEncodingException;
+import java.net.InetAddress;
 import java.util.List;
 import java.util.Scanner;
 
@@ -40,7 +41,7 @@ public class Application {
 
     private BitmessageContext ctx;
 
-    public Application() {
+    public Application(String syncServer, int syncPort) {
         JdbcConfig jdbcConfig = new JdbcConfig();
         ctx = new BitmessageContext.Builder()
                 .addressRepo(new JdbcAddressRepository(jdbcConfig))
@@ -63,7 +64,9 @@ public class Application {
                 })
                 .build();
 
+        if (syncServer == null) {
             ctx.startup();
+        }
 
         scanner = new Scanner(System.in);
 
@@ -75,6 +78,9 @@ public class Application {
             System.out.println("c) contacts");
             System.out.println("s) subscriptions");
             System.out.println("m) messages");
+            if (syncServer != null) {
+                System.out.println("y) sync");
+            }
             System.out.println("?) info");
             System.out.println("e) exit");
 
@@ -99,6 +105,9 @@ public class Application {
                         break;
                     case "e":
                         break;
+                    case "y":
+                        ctx.synchronize(InetAddress.getByName(syncServer), syncPort, 120, true);
+                        break;
                     default:
                         System.out.println("Unknown command. Please try again.");
                 }

demo/src/main/java/ch/dissem/bitmessage/demo/Main.java

@@ -64,7 +64,7 @@ public class Main {
                 new WifImporter(ctx, options.importWIF).importAll();
             }
         } else {
-            new Application();
+            new Application(options.syncServer, options.syncPort);
         }
     }
 
@@ -74,5 +74,11 @@ public class Main {
 
         @Option(name = "-export", usage = "Export to WIF file.")
         private File exportWIF;
+
+        @Option(name = "-syncServer", usage = "Use manual synchronization with the given server instead of starting a full node.")
+        private String syncServer;
+
+        @Option(name = "-syncPort", usage = "Port to use for synchronisation")
+        private int syncPort = 8444;
     }
 }

networking/src/main/java/ch/dissem/bitmessage/networking/Connection.java

@@ -139,13 +139,13 @@ class Connection {
 
     @SuppressWarnings("RedundantIfStatement")
     private boolean syncFinished(NetworkMessage msg) {
-        if (mode != SYNC){
+        if (mode != SYNC) {
             return false;
         }
         if (Thread.interrupted()) {
             return true;
         }
-        if (syncTimeout == 0 || state != ACTIVE) {
+        if (state != ACTIVE) {
             return false;
         }
         if (syncTimeout < UnixTime.now()) {
@@ -204,10 +204,11 @@ class Connection {
         switch (messagePayload.getCommand()) {
             case INV:
                 Inv inv = (Inv) messagePayload;
+                int originalSize = inv.getInventory().size();
                 updateIvCache(inv.getInventory());
                 List<InventoryVector> missing = ctx.getInventory().getMissing(inv.getInventory(), streams);
                 missing.removeAll(commonRequestedObjects);
-                LOG.debug("Received inventory with " + inv.getInventory().size() + " elements, of which are "
+                LOG.debug("Received inventory with " + originalSize + " elements, of which are "
                         + missing.size() + " missing.");
                 send(new GetData.Builder().inventory(missing).build());
                 break;
@@ -230,8 +231,6 @@ class Connection {
                     security().checkProofOfWork(objectMessage, ctx.getNetworkNonceTrialsPerByte(), ctx.getNetworkExtraBytes());
                     ctx.getInventory().storeObject(objectMessage);
                     // offer object to some random nodes so it gets distributed throughout the network:
-                    // FIXME: don't do this while we catch up after initialising our first connection
-                    // (that might be a bit tricky to do)
                     networkHandler.offer(objectMessage.getInventoryVector());
                     lastObjectTime = UnixTime.now();
                 } catch (InsufficientProofOfWorkException e) {
@@ -283,7 +282,9 @@ class Connection {
             if (payload instanceof GetData) {
                 requestedObjects.addAll(((GetData) payload).getInventory());
             }
+            synchronized (this) {
                 new NetworkMessage(payload).write(out);
+            }
         } catch (IOException e) {
             LOG.error(e.getMessage(), e);
             disconnect();
@@ -342,17 +343,20 @@ class Connection {
     public class ReaderRunnable implements Runnable {
         @Override
         public void run() {
+            lastObjectTime = 0;
             try (Socket socket = Connection.this.socket) {
                 initSocket(socket);
                 if (mode == CLIENT || mode == SYNC) {
                     send(new Version.Builder().defaults().addrFrom(host).addrRecv(node).build());
                 }
                 while (state != DISCONNECTED) {
-                    if (mode != SYNC && state == ACTIVE && requestedObjects.isEmpty()) {
+                    if (mode != SYNC) {
+                        if (state == ACTIVE && requestedObjects.isEmpty() && sendingQueue.isEmpty()) {
                             Thread.sleep(1000);
                         } else {
                             Thread.sleep(100);
                         }
+                    }
                     try {
                         NetworkMessage msg = Factory.getNetworkMessage(version, in);
                         if (msg == null)

networking/src/test/java/ch/dissem/bitmessage/networking/NetworkHandlerTest.java

@@ -117,7 +117,8 @@ public class NetworkHandlerTest {
         );
 
         nodeInventory.init(
-                "V1Msg.payload"
+                "V1Msg.payload",
+                "V4Pubkey.payload"
         );
 
         Future<?> future = networkHandler.synchronize(InetAddress.getLocalHost(), 6001,

repositories/src/main/java/ch/dissem/bitmessage/repository/JdbcMessageRepository.java

@@ -256,12 +256,13 @@ public class JdbcMessageRepository extends JdbcHelper implements MessageReposito
 
     private void update(Connection connection, Plaintext message) throws SQLException, IOException {
         PreparedStatement ps = connection.prepareStatement(
-                "UPDATE Message SET iv=?, sent=?, received=?, status=? WHERE id=?");
+                "UPDATE Message SET iv=?, sent=?, received=?, status=?, initial_hash=? WHERE id=?");
         ps.setBytes(1, message.getInventoryVector() != null ? message.getInventoryVector().getHash() : null);
         ps.setLong(2, message.getSent());
         ps.setLong(3, message.getReceived());
         ps.setString(4, message.getStatus() != null ? message.getStatus().name() : null);
-        ps.setLong(5, (Long) message.getId());
+        ps.setBytes(5, message.getInitialHash());
+        ps.setLong(6, (Long) message.getId());
         ps.executeUpdate();
     }