2008-02-01 Tatsuhiro Tsujikawa <tujikawa at rednoah dot com>

	Added DHT functionality, compatible with mainline.
	DHT is disabled by default. To enable it, give --enable-dht to 
aria2c.
	You may need to specify entry point to DHT network using
	--dht-entry-point. DHT uses UDP port to listen incoming message.
	Use --dht-listen-port to specify port number. Make sure that 
your
	firewall configuration can pass through UDP traffic to the port.
	The routing table is saved in $HOME/.aria2/dht.dat.
	* src/DHT*
	* src/BNode.{h, cc}
	* src/PeerInteractionCommand.cc: enable DHT functionality for a
	particular torrent.
	* src/Data.cc: Rewritten ctor.
	* src/OptionHandlerFactory.cc: Added --enable-dht, 
--dht-listen-port,
	--dht-entry-point.
	* src/DefaultBtInteractive.cc: Send port message if dht is 
enabled.
	* src/RequestGroup.cc: Initialize DHT functionality. When 
download
	ends, remove BtContext from DHTPeerAnnounceStorage.
	* src/BtPortMessage.{h, cc}: Rewritten.
	* src/message.h
	* src/OptionHandlerImpl.cc
	* src/option_processing.cc: Added --enable-dht, 
--dht-listen-port,
	--dht-entry-point.
	* src/Dictionary.{h, cc} (remove): New function.
	* src/prefs.h
	* src/DefaultBtMessageFactory.h
	* src/BtHandshakeMessage.cc
	* src/ActivePeerConnectionCommand.cc
	* src/SocketCore.{h, cc}: Added datagram socket support.
	* src/DefaultBtMessageFactory.cc
	* src/BtSetup.cc: Add BtContext to DHTPeerAnnounceStorage here.
	Create DHT commands.
	* src/BtMessageFactory.h
	* src/PeerMessageUtil.{h, cc}

1 files changed, 109 insertions, 0 deletions

diff --git a/src/DHTAutoSaveCommand.cc b/src/DHTAutoSaveCommand.cc
new file mode 100644
index 00000000..b7809bf9
--- /dev/null
+++ b/src/DHTAutoSaveCommand.cc
@@ -0,0 +1,109 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "DHTAutoSaveCommand.h"
+#include "DHTRoutingTable.h"
+#include "DHTNode.h"
+#include "File.h"
+#include "DHTRoutingTableSerializer.h"
+#include "RecoverableException.h"
+#include "DownloadEngine.h"
+#include "Util.h"
+#include "DHTBucket.h"
+#include "RequestGroupMan.h"
+#include "prefs.h"
+#include "Option.h"
+#include <fstream>
+
+DHTAutoSaveCommand::DHTAutoSaveCommand(int32_t cuid, DownloadEngine* e, int32_t interval):
+  TimeBasedCommand(cuid, e, interval),
+  _localNode(0),
+  _routingTable(0) {}
+
+DHTAutoSaveCommand::~DHTAutoSaveCommand() {}
+
+void DHTAutoSaveCommand::preProcess()
+{
+  if(_e->_requestGroupMan->downloadFinished() || _e->isHaltRequested()) {
+    save();
+    _exit = true;
+  }
+}
+
+void DHTAutoSaveCommand::process()
+{
+  save();
+}
+
+void DHTAutoSaveCommand::save()
+{
+  DHTNodes nodes;
+  DHTBuckets buckets = _routingTable->getBuckets();
+  for(DHTBuckets::const_iterator i = buckets.begin(); i != buckets.end(); ++i) {
+    const DHTBucketHandle& bucket = *i;
+    DHTNodes goodNodes = bucket->getGoodNodes();
+    nodes.insert(nodes.end(), goodNodes.begin(), goodNodes.end());
+  }
+
+  DHTRoutingTableSerializer serializer;
+  serializer.setLocalNode(_localNode);
+  serializer.setNodes(nodes);
+
+  string dhtFile = _e->option->get(PREF_DHT_FILE_PATH);
+  string tempFile = dhtFile+"__temp";
+  ofstream o(tempFile.c_str(), ios::out|ios::binary);
+  o.exceptions(ios::failbit);
+  try {
+    serializer.serialize(o);
+
+    if(!File(tempFile).renameTo(dhtFile)) {
+      logger->error("Cannot move file from %s to %s.",
+		    tempFile.c_str(), dhtFile.c_str());
+    }
+  } catch(RecoverableException* e) {
+    logger->error("Exception caught while saving DHT routing table to %s",
+		  e, tempFile.c_str());
+    delete e;
+  }
+}
+
+void DHTAutoSaveCommand::setLocalNode(const DHTNodeHandle& localNode)
+{
+  _localNode = localNode;
+}
+
+void DHTAutoSaveCommand::setRoutingTable(const DHTRoutingTableHandle& routingTable)
+{
+  _routingTable = routingTable;
+}