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}

test/MockDHTMessageFactory.h

@@ -0,0 +1,117 @@
+#ifndef _D_MOCK_DHT_MESSAGE_FACTORY_H_
+#define _D_MOCK_DHT_MESSAGE_FACTORY_H_
+
+#include "DHTMessageFactory.h"
+#include "DHTNode.h"
+#include "MockDHTMessage.h"
+#include "Dictionary.h"
+#include "Data.h"
+
+class MockDHTMessageFactory:public DHTMessageFactory {
+private:
+  DHTNodeHandle _localNode;
+public:
+  MockDHTMessageFactory() {}
+
+  virtual ~MockDHTMessageFactory() {}
+
+  virtual DHTMessageHandle
+  createQueryMessage(const Dictionary* d,
+		     const string& ipaddr, uint16_t port)
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createResponseMessage(const string& messageType,
+			const Dictionary* d,
+			const DHTNodeHandle& remoteNode)
+  {
+    MockDHTMessageHandle m = new MockDHTMessage(_localNode, remoteNode,
+						reinterpret_cast<const Data*>(d->get("t"))->toString());
+    m->setReply(true);
+    return m;
+  }
+
+  virtual DHTMessageHandle
+  createPingMessage(const DHTNodeHandle& remoteNode,
+		    const string& transactionID = "")
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createPingReplyMessage(const DHTNodeHandle& remoteNode,
+			 const unsigned char* remoteNodeID,
+			 const string& transactionID)
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createFindNodeMessage(const DHTNodeHandle& remoteNode,
+			const unsigned char* targetNodeID,
+			const string& transactionID = "")
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createFindNodeReplyMessage(const DHTNodeHandle& remoteNode,
+			     const DHTNodes& closestKNodes,
+			     const string& transactionID)
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createGetPeersMessage(const DHTNodeHandle& remoteNode,
+			const unsigned char* infoHash,
+			const string& transactionID)
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createGetPeersReplyMessage(const DHTNodeHandle& remoteNode,
+			     const DHTNodes& closestKNodes,
+			     const string& transactionID,
+			     const string& token = "")
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createGetPeersReplyMessage(const DHTNodeHandle& remoteNode,
+			     const Peers& peers,
+			     const string& transactionID,
+			     const string& token = "")
+  {
+    return 0;
+  }
+  
+  virtual DHTMessageHandle
+  createAnnouncePeerMessage(const DHTNodeHandle& remoteNode,
+			    const unsigned char* infoHash,
+			    uint16_t tcpPort,
+			    const string& token,
+			    const string& transactionID = "")
+  {
+    return 0;
+  }
+
+  virtual DHTMessageHandle
+  createAnnouncePeerReplyMessage(const DHTNodeHandle& remoteNode,
+				 const string& transactionID)
+  {
+    return 0;
+  }
+
+  void setLocalNode(const DHTNodeHandle& node)
+  {
+    _localNode = node;
+  }
+};
+
+typedef SharedHandle<MockDHTMessageFactory> MockDHTMessageFactoryHandle;
+#endif // _D_MOCK_DHT_MESSAGE_FACTORY_H_