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, 123 insertions, 0 deletions

diff --git a/src/DHTNode.h b/src/DHTNode.h
new file mode 100644
index 00000000..c6af39aa
--- /dev/null
+++ b/src/DHTNode.h
@@ -0,0 +1,123 @@
+/* <!-- 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 --> */
+#ifndef _D_DHT_NODE_H_
+#define _D_DHT_NODE_H_
+
+#include "common.h"
+#include "DHTConstants.h"
+#include "DHTNodeDecl.h"
+#include "TimeA2.h"
+
+class DHTNode {
+private:
+  unsigned char _id[DHT_ID_LENGTH];
+
+  string _ipaddr;
+
+  uint16_t _port;
+
+  // in milli sec
+  int32_t _rtt;
+
+  uint32_t _condition;
+
+  Time _lastContact;
+public:
+  DHTNode();
+  
+  /**
+   * id must be 20 bytes length
+   */
+  DHTNode(const unsigned char* id);
+
+  void generateID();
+
+  const unsigned char* getID() const
+  {
+    return _id;
+  }
+
+  void updateRTT(int32_t millisec)
+  {
+    _rtt = millisec;
+  }
+
+  string getIPAddress() const
+  {
+    return _ipaddr;
+  }
+
+  void setIPAddress(const string& ipaddr)
+  {
+    _ipaddr = ipaddr;
+  }
+
+  void setID(const unsigned char* id)
+  {
+    memcpy(_id, id, DHT_ID_LENGTH);
+  }
+
+  uint16_t getPort() const
+  {
+    return _port;
+  }
+
+  void setPort(uint16_t port)
+  {
+    _port = port;
+  }
+
+  bool isGood() const;
+
+  bool isBad() const;
+
+  bool isQuestionable() const;
+
+  void updateLastContact();
+
+  void markGood();
+
+  void markBad();
+
+  void timeout();
+
+  bool operator==(const DHTNode& node) const;
+
+  bool operator<(const DHTNode& node) const;
+
+  string toString() const;
+};
+
+#endif // _D_DHT_NODE_H_