/** Handle an FNPRoutedRejected message. */
 private boolean handleRoutedRejected(Message m) {
   long id = m.getLong(DMT.UID);
   Long lid = Long.valueOf(id);
   RoutedContext rc = routedContexts.get(lid);
   if (rc == null) {
     // Gah
     Logger.error(this, "Unrecognized FNPRoutedRejected");
     return false; // locally originated??
   }
   short htl = rc.lastHtl;
   if (rc.source != null) htl = rc.source.decrementHTL(htl);
   short ohtl = m.getShort(DMT.HTL);
   if (ohtl < htl) htl = ohtl;
   if (htl == 0) {
     // Equivalent to DNF.
     // Relay.
     if (rc.source != null) {
       try {
         rc.source.sendAsync(
             DMT.createFNPRoutedRejected(id, (short) 0), null, nodeStats.routedMessageCtr);
       } catch (NotConnectedException e) {
         // Ouch.
         Logger.error(this, "Unable to relay probe DNF: peer disconnected: " + rc.source);
       }
     }
   } else {
     // Try routing to the next node
     forward(rc.msg, id, rc.source, htl, rc.msg.getDouble(DMT.TARGET_LOCATION), rc, rc.identity);
   }
   return true;
 }
  private boolean handleGetOfferedKey(Message m, PeerNode source) {
    Key key = (Key) m.getObject(DMT.KEY);
    byte[] authenticator = ((ShortBuffer) m.getObject(DMT.OFFER_AUTHENTICATOR)).getData();
    long uid = m.getLong(DMT.UID);
    if (!HMAC.verifyWithSHA256(
        node.failureTable.offerAuthenticatorKey, key.getFullKey(), authenticator)) {
      Logger.error(
          this, "Invalid offer request from " + source + " : authenticator did not verify");
      try {
        source.sendAsync(
            DMT.createFNPGetOfferedKeyInvalid(uid, DMT.GET_OFFERED_KEY_REJECTED_BAD_AUTHENTICATOR),
            null,
            node.failureTable.senderCounter);
      } catch (NotConnectedException e) {
        // Too bad.
      }
      return true;
    }
    if (logMINOR) Logger.minor(this, "Valid GetOfferedKey for " + key + " from " + source);

    // Do we want it? We can RejectOverload if we don't have the bandwidth...
    boolean isSSK = key instanceof NodeSSK;
    OfferReplyTag tag = new OfferReplyTag(isSSK);
    node.lockUID(uid, isSSK, false, true, false, tag);
    boolean needPubKey;
    try {
      needPubKey = m.getBoolean(DMT.NEED_PUB_KEY);
      String reject = nodeStats.shouldRejectRequest(true, false, isSSK, false, true, source, false);
      if (reject != null) {
        Logger.normal(
            this, "Rejecting FNPGetOfferedKey from " + source + " for " + key + " : " + reject);
        Message rejected = DMT.createFNPRejectedOverload(uid, true);
        try {
          source.sendAsync(rejected, null, node.failureTable.senderCounter);
        } catch (NotConnectedException e) {
          Logger.normal(
              this, "Rejecting (overload) data request from " + source.getPeer() + ": " + e);
        }
        node.unlockUID(uid, isSSK, false, false, true, false, tag);
        return true;
      }

    } catch (Error e) {
      node.unlockUID(uid, isSSK, false, false, true, false, tag);
      throw e;
    } catch (RuntimeException e) {
      node.unlockUID(uid, isSSK, false, false, true, false, tag);
      throw e;
    } // Otherwise, sendOfferedKey is responsible for unlocking.

    // Accept it.

    try {
      node.failureTable.sendOfferedKey(key, isSSK, needPubKey, uid, source, tag);
    } catch (NotConnectedException e) {
      // Too bad.
    }
    return true;
  }
  /**
   * Handle a routed-to-a-specific-node message.
   *
   * @param m
   * @return False if we want the message put back on the queue.
   */
  boolean handleRouted(Message m, PeerNode source) {
    if (logMINOR) Logger.minor(this, "handleRouted(" + m + ')');

    long id = m.getLong(DMT.UID);
    Long lid = Long.valueOf(id);
    short htl = m.getShort(DMT.HTL);
    byte[] identity = ((ShortBuffer) m.getObject(DMT.NODE_IDENTITY)).getData();
    if (source != null) htl = source.decrementHTL(htl);
    RoutedContext ctx;
    ctx = routedContexts.get(lid);
    if (ctx != null) {
      try {
        source.sendAsync(DMT.createFNPRoutedRejected(id, htl), null, nodeStats.routedMessageCtr);
      } catch (NotConnectedException e) {
        if (logMINOR) Logger.minor(this, "Lost connection rejecting " + m);
      }
      return true;
    }
    ctx = new RoutedContext(m, source, identity);
    synchronized (routedContexts) {
      routedContexts.put(lid, ctx);
    }
    // source == null => originated locally, keep full htl
    double target = m.getDouble(DMT.TARGET_LOCATION);
    if (logMINOR)
      Logger.minor(this, "id " + id + " from " + source + " htl " + htl + " target " + target);
    if (Math.abs(node.lm.getLocation() - target) <= Double.MIN_VALUE) {
      if (logMINOR)
        Logger.minor(this, "Dispatching " + m.getSpec() + " on " + node.getDarknetPortNumber());
      // Handle locally
      // Message type specific processing
      dispatchRoutedMessage(m, source, id);
      return true;
    } else if (htl == 0) {
      Message reject = DMT.createFNPRoutedRejected(id, (short) 0);
      if (source != null)
        try {
          source.sendAsync(reject, null, nodeStats.routedMessageCtr);
        } catch (NotConnectedException e) {
          if (logMINOR) Logger.minor(this, "Lost connection rejecting " + m);
        }
      return true;
    } else {
      return forward(m, id, source, htl, target, ctx, identity);
    }
  }
 boolean handleRoutedReply(Message m) {
   long id = m.getLong(DMT.UID);
   if (logMINOR) Logger.minor(this, "Got reply: " + m);
   Long lid = Long.valueOf(id);
   RoutedContext ctx = routedContexts.get(lid);
   if (ctx == null) {
     Logger.error(this, "Unrecognized routed reply: " + m);
     return false;
   }
   PeerNode pn = ctx.source;
   if (pn == null) return false;
   try {
     pn.sendAsync(m, null, nodeStats.routedMessageCtr);
   } catch (NotConnectedException e) {
     if (logMINOR) Logger.minor(this, "Lost connection forwarding " + m + " to " + pn);
   }
   return true;
 }
 private boolean handleAnnounceRequest(Message m, PeerNode source) {
   long uid = m.getLong(DMT.UID);
   OpennetManager om = node.getOpennet();
   if (om == null || !source.canAcceptAnnouncements()) {
     Message msg = DMT.createFNPOpennetDisabled(uid);
     try {
       source.sendAsync(msg, null, node.nodeStats.announceByteCounter);
     } catch (NotConnectedException e) {
       // Ok
     }
     return true;
   }
   if (node.recentlyCompleted(uid)) {
     Message msg = DMT.createFNPRejectedLoop(uid);
     try {
       source.sendAsync(msg, null, node.nodeStats.announceByteCounter);
     } catch (NotConnectedException e) {
       // Ok
     }
     return true;
   }
   boolean success = false;
   // No way to check whether it's actually running atm, so lets report it to the completed list
   // immediately.
   // FIXME we should probably keep a list!
   node.completed(uid);
   try {
     if (!source.shouldAcceptAnnounce(uid)) {
       Message msg = DMT.createFNPRejectedOverload(uid, true);
       try {
         source.sendAsync(msg, null, node.nodeStats.announceByteCounter);
       } catch (NotConnectedException e) {
         // Ok
       }
       return true;
     }
     AnnounceSender sender = new AnnounceSender(m, uid, source, om, node);
     node.executor.execute(sender, "Announcement sender for " + uid);
     success = true;
     return true;
   } finally {
     if (!success) source.completedAnnounce(uid);
   }
 }
  private static long getSecretPingResponse(Node source, PeerNode pathway, long uid)
      throws DisconnectedException {
    // wait for a reject or pong
    MessageFilter mfPong =
        MessageFilter.create()
            .setSource(pathway)
            .setField(DMT.UID, uid)
            .setTimeout(SECRETPONG_TIMEOUT)
            .setType(DMT.FNPSecretPong);
    MessageFilter mfRejectLoop =
        MessageFilter.create()
            .setSource(pathway)
            .setField(DMT.UID, uid)
            .setTimeout(SECRETPONG_TIMEOUT)
            .setType(DMT.FNPRejectedLoop);
    Message msg = source.getUSM().waitFor(mfPong.or(mfRejectLoop), null);

    if (msg == null) {
      Logger.error(
          source, "fatal timeout in waiting for secretpong from " + getPortNumber(pathway));
      return -2;
    }

    if (msg.getSpec() == DMT.FNPSecretPong) {
      int suppliedCounter = msg.getInt(DMT.COUNTER);
      long secret = msg.getLong(DMT.SECRET);
      Logger.normal(source, "got secret, counter=" + suppliedCounter);
      return secret;
    }

    if (msg.getSpec() == DMT.FNPRejectedLoop) {
      Logger.error(
          source,
          "top level secret ping should not reject!: "
              + getPortNumber(source)
              + " -> "
              + getPortNumber(pathway));
      return -1;
    }

    return -3;
  }
 private boolean handleProbeRequest(Message m, PeerNode source) {
   long id = m.getLong(DMT.UID);
   if (node.recentlyCompleted(id)) {
     Message rejected = DMT.createFNPRejectedLoop(id);
     try {
       source.sendAsync(rejected, null, node.nodeStats.probeRequestCtr);
     } catch (NotConnectedException e) {
       Logger.normal(this, "Rejecting probe request from " + source.getPeer() + ": " + e);
     }
     return true;
   }
   // Lets not bother with full lockUID, just add it to the recently completed list.
   node.completed(id);
   // SSKs don't fix bwlimitDelayTime so shouldn't be accepted when overloaded.
   if (source.shouldRejectProbeRequest()) {
     Logger.normal(this, "Rejecting probe request from " + source.getPeer());
     Message rejected = DMT.createFNPRejectedOverload(id, true);
     try {
       source.sendAsync(rejected, null, node.nodeStats.probeRequestCtr);
     } catch (NotConnectedException e) {
       Logger.normal(
           this, "Rejecting (overload) insert request from " + source.getPeer() + ": " + e);
     }
     return true;
   }
   double target = m.getDouble(DMT.TARGET_LOCATION);
   if (target > 1.0 || target < 0.0) {
     Logger.normal(
         this, "Rejecting invalid (target=" + target + ") probe request from " + source.getPeer());
     Message rejected = DMT.createFNPRejectedOverload(id, true);
     try {
       source.sendAsync(rejected, null, node.nodeStats.probeRequestCtr);
     } catch (NotConnectedException e) {
       Logger.normal(
           this, "Rejecting (invalid) insert request from " + source.getPeer() + ": " + e);
     }
     return true;
   }
   ProbeRequestHandler.start(m, source, node, target);
   return true;
 }
 static void start(Message m, PeerNode source, Node n, double target) {
   long uid = m.getLong(DMT.UID);
   double nearestLoc = m.getDouble(DMT.NEAREST_LOCATION);
   double best = m.getDouble(DMT.BEST_LOCATION);
   short htl = m.getShort(DMT.HTL);
   ProbeRequestSender sender =
       new ProbeRequestSender(target, htl, uid, n, nearestLoc, source, best);
   ProbeRequestHandler handler = new ProbeRequestHandler(source, uid, sender);
   sender.addListener(handler);
   PeerNode[] peers = n.peers.connectedPeers;
   Message accepted = DMT.createFNPAccepted(uid);
   Message trace =
       DMT.createFNPRHProbeTrace(
           uid,
           sender.getNearestLoc(),
           sender.getBest(),
           htl,
           (short) 1,
           (short) 1,
           n.getLocation(),
           n.swapIdentifier,
           LocationManager.extractLocs(peers, true),
           LocationManager.extractUIDs(peers),
           (short) 0,
           (short) 1,
           "",
           source.swapIdentifier);
   try {
     source.sendAsync(accepted, null, sender);
     source.sendAsync(trace, null, sender);
   } catch (NotConnectedException e) {
     // We completed(id), rather than locking it, so we don't need to unlock.
     return; // So all we need to do is not start the sender.
   }
   sender.start();
 }
 private boolean handleInsertRequest(Message m, PeerNode source, boolean isSSK) {
   ByteCounter ctr = isSSK ? node.nodeStats.sskInsertCtr : node.nodeStats.chkInsertCtr;
   long id = m.getLong(DMT.UID);
   if (node.recentlyCompleted(id)) {
     Message rejected = DMT.createFNPRejectedLoop(id);
     try {
       source.sendAsync(rejected, null, ctr);
     } catch (NotConnectedException e) {
       Logger.normal(this, "Rejecting insert request from " + source.getPeer() + ": " + e);
     }
     return true;
   }
   InsertTag tag = new InsertTag(isSSK, InsertTag.START.REMOTE);
   if (!node.lockUID(id, isSSK, true, false, false, tag)) {
     if (logMINOR)
       Logger.minor(this, "Could not lock ID " + id + " -> rejecting (already running)");
     Message rejected = DMT.createFNPRejectedLoop(id);
     try {
       source.sendAsync(rejected, null, ctr);
     } catch (NotConnectedException e) {
       Logger.normal(this, "Rejecting insert request from " + source.getPeer() + ": " + e);
     }
     return true;
   }
   // SSKs don't fix bwlimitDelayTime so shouldn't be accepted when overloaded.
   String rejectReason =
       nodeStats.shouldRejectRequest(!isSSK, true, isSSK, false, false, source, false);
   if (rejectReason != null) {
     Logger.normal(
         this,
         "Rejecting insert from " + source.getPeer() + " preemptively because " + rejectReason);
     Message rejected = DMT.createFNPRejectedOverload(id, true);
     try {
       source.sendAsync(rejected, null, ctr);
     } catch (NotConnectedException e) {
       Logger.normal(
           this, "Rejecting (overload) insert request from " + source.getPeer() + ": " + e);
     }
     node.unlockUID(id, isSSK, true, false, false, false, tag);
     return true;
   }
   boolean forkOnCacheable = Node.FORK_ON_CACHEABLE_DEFAULT;
   Message forkControl = m.getSubMessage(DMT.FNPSubInsertForkControl);
   if (forkControl != null)
     forkOnCacheable = forkControl.getBoolean(DMT.ENABLE_INSERT_FORK_WHEN_CACHEABLE);
   long now = System.currentTimeMillis();
   if (m.getSpec().equals(DMT.FNPSSKInsertRequest)) {
     NodeSSK key = (NodeSSK) m.getObject(DMT.FREENET_ROUTING_KEY);
     byte[] data = ((ShortBuffer) m.getObject(DMT.DATA)).getData();
     byte[] headers = ((ShortBuffer) m.getObject(DMT.BLOCK_HEADERS)).getData();
     short htl = m.getShort(DMT.HTL);
     SSKInsertHandler rh =
         new SSKInsertHandler(
             key,
             data,
             headers,
             htl,
             source,
             id,
             node,
             now,
             tag,
             node.canWriteDatastoreInsert(htl),
             forkOnCacheable);
     rh.receivedBytes(m.receivedByteCount());
     node.executor.execute(
         rh, "SSKInsertHandler for " + id + " on " + node.getDarknetPortNumber());
   } else if (m.getSpec().equals(DMT.FNPSSKInsertRequestNew)) {
     NodeSSK key = (NodeSSK) m.getObject(DMT.FREENET_ROUTING_KEY);
     short htl = m.getShort(DMT.HTL);
     SSKInsertHandler rh =
         new SSKInsertHandler(
             key,
             null,
             null,
             htl,
             source,
             id,
             node,
             now,
             tag,
             node.canWriteDatastoreInsert(htl),
             forkOnCacheable);
     rh.receivedBytes(m.receivedByteCount());
     node.executor.execute(
         rh, "SSKInsertHandler for " + id + " on " + node.getDarknetPortNumber());
   } else {
     CHKInsertHandler rh = new CHKInsertHandler(m, source, id, node, now, tag, forkOnCacheable);
     node.executor.execute(
         rh, "CHKInsertHandler for " + id + " on " + node.getDarknetPortNumber());
   }
   if (logMINOR) Logger.minor(this, "Started InsertHandler for " + id);
   return true;
 }
  /** Handle an incoming FNPDataRequest. */
  private boolean handleDataRequest(Message m, PeerNode source, boolean isSSK) {
    long id = m.getLong(DMT.UID);
    ByteCounter ctr = isSSK ? node.nodeStats.sskRequestCtr : node.nodeStats.chkRequestCtr;
    if (node.recentlyCompleted(id)) {
      Message rejected = DMT.createFNPRejectedLoop(id);
      try {
        source.sendAsync(rejected, null, ctr);
      } catch (NotConnectedException e) {
        Logger.normal(this, "Rejecting data request (loop, finished): " + e);
      }
      return true;
    }
    short htl = m.getShort(DMT.HTL);
    Key key = (Key) m.getObject(DMT.FREENET_ROUTING_KEY);
    final RequestTag tag = new RequestTag(isSSK, RequestTag.START.REMOTE);
    if (!node.lockUID(id, isSSK, false, false, false, tag)) {
      if (logMINOR)
        Logger.minor(this, "Could not lock ID " + id + " -> rejecting (already running)");
      Message rejected = DMT.createFNPRejectedLoop(id);
      try {
        source.sendAsync(rejected, null, ctr);
      } catch (NotConnectedException e) {
        Logger.normal(this, "Rejecting request from " + source.getPeer() + ": " + e);
      }
      node.failureTable.onFinalFailure(key, null, htl, htl, -1, source);
      return true;
    } else {
      if (logMINOR) Logger.minor(this, "Locked " + id);
    }

    // There are at least 2 threads that call this function.
    // DO NOT reuse the meta object, unless on a per-thread basis.
    // Object allocation is pretty cheap in modern Java anyway...
    // If we do reuse it, call reset().
    BlockMetadata meta = new BlockMetadata();
    KeyBlock block = node.fetch(key, false, false, false, false, meta);

    String rejectReason =
        nodeStats.shouldRejectRequest(
            !isSSK, false, isSSK, false, false, source, block != null && !meta.isOldBlock());
    if (rejectReason != null) {
      // can accept 1 CHK request every so often, but not with SSKs because they aren't throttled so
      // won't sort out bwlimitDelayTime, which was the whole reason for accepting them when
      // overloaded...
      Logger.normal(
          this,
          "Rejecting "
              + (isSSK ? "SSK" : "CHK")
              + " request from "
              + source.getPeer()
              + " preemptively because "
              + rejectReason);
      Message rejected = DMT.createFNPRejectedOverload(id, true);
      try {
        source.sendAsync(rejected, null, ctr);
      } catch (NotConnectedException e) {
        Logger.normal(
            this, "Rejecting (overload) data request from " + source.getPeer() + ": " + e);
      }
      tag.setRejected();
      node.unlockUID(id, isSSK, false, false, false, false, tag);
      // Do not tell failure table.
      // Otherwise an attacker can flood us with requests very cheaply and purge our
      // failure table even though we didn't accept any of them.
      return true;
    }
    nodeStats.reportIncomingRequestLocation(key.toNormalizedDouble());
    // if(!node.lockUID(id)) return false;
    RequestHandler rh = new RequestHandler(m, source, id, node, htl, key, tag, block);
    node.executor.execute(
        rh, "RequestHandler for UID " + id + " on " + node.getDarknetPortNumber());
    return true;
  }
 private boolean handleTime(Message m, PeerNode source) {
   long delta = m.getLong(DMT.TIME) - System.currentTimeMillis();
   source.setTimeDelta(delta);
   return true;
 }