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/DHTMessageTrackerTest.cc

@@ -0,0 +1,112 @@
+#include "DHTMessageTracker.h"
+#include "Exception.h"
+#include "Util.h"
+#include "MockDHTMessage.h"
+#include "MockDHTMessageCallback.h"
+#include "DHTNode.h"
+#include "MetaEntry.h"
+#include "DHTMessageTrackerEntry.h"
+#include "DHTRoutingTable.h"
+#include "MockDHTMessageFactory.h"
+#include "Dictionary.h"
+#include "Data.h"
+#include <cppunit/extensions/HelperMacros.h>
+
+class DHTMessageTrackerTest:public CppUnit::TestFixture {
+
+  CPPUNIT_TEST_SUITE(DHTMessageTrackerTest);
+  CPPUNIT_TEST(testMessageArrived);
+  CPPUNIT_TEST(testHandleTimeout);
+  CPPUNIT_TEST_SUITE_END();
+public:
+  void setUp() {}
+
+  void tearDown() {}
+
+  void testMessageArrived();
+
+  void testHandleTimeout();
+
+  class MockDHTMessageCallback2:public MockDHTMessageCallback {
+  public:
+    uint32_t _countOnRecivedCalled;
+
+    MockDHTMessageCallback2():_countOnRecivedCalled(0) {}
+
+    virtual void onReceived(const DHTMessageHandle& message)
+    {
+      ++_countOnRecivedCalled;
+    }
+  };
+
+  typedef SharedHandle<MockDHTMessageCallback2> MockDHTMessageCallback2Handle;
+};
+
+
+CPPUNIT_TEST_SUITE_REGISTRATION(DHTMessageTrackerTest);
+
+void DHTMessageTrackerTest::testMessageArrived()
+{
+  DHTNodeHandle localNode = new DHTNode();
+  DHTRoutingTableHandle routingTable = new DHTRoutingTable(localNode);
+  MockDHTMessageFactoryHandle factory = new MockDHTMessageFactory();
+  factory->setLocalNode(localNode);
+
+  MockDHTMessageHandle m1 = new MockDHTMessage(localNode, new DHTNode());
+  MockDHTMessageHandle m2 = new MockDHTMessage(localNode, new DHTNode());
+  MockDHTMessageHandle m3 = new MockDHTMessage(localNode, new DHTNode());
+
+  m1->getRemoteNode()->setIPAddress("192.168.0.1");
+  m1->getRemoteNode()->setPort(6881);
+  m2->getRemoteNode()->setIPAddress("192.168.0.2");
+  m2->getRemoteNode()->setPort(6882);
+  m3->getRemoteNode()->setIPAddress("192.168.0.3");
+  m3->getRemoteNode()->setPort(6883);
+
+  MockDHTMessageCallback2Handle c2 = new MockDHTMessageCallback2();
+  
+  DHTMessageTracker tracker;
+  tracker.setRoutingTable(routingTable);
+  tracker.setMessageFactory(factory);
+  tracker.addMessage(m1);
+  tracker.addMessage(m2, c2);
+  tracker.addMessage(m3);
+
+  {
+    SharedHandle<Dictionary> res = new Dictionary();
+    res->put("t", new Data(m2->getTransactionID()));
+    
+    std::pair<DHTMessageHandle, DHTMessageCallbackHandle> p =
+      tracker.messageArrived(res.get(), m2->getRemoteNode()->getIPAddress(), m2->getRemoteNode()->getPort());
+    DHTMessageHandle reply = p.first;
+
+    CPPUNIT_ASSERT(!reply.isNull());
+    CPPUNIT_ASSERT_EQUAL((uint32_t)0, c2->_countOnRecivedCalled);
+    CPPUNIT_ASSERT(tracker.getEntryFor(m2).isNull());
+    CPPUNIT_ASSERT_EQUAL((size_t)2, tracker.countEntry());
+  }
+  {
+    SharedHandle<Dictionary> res = new Dictionary();
+    res->put("t", new Data(m3->getTransactionID()));
+
+    std::pair<DHTMessageHandle, DHTMessageCallbackHandle> p = tracker.messageArrived(res.get(), m3->getRemoteNode()->getIPAddress(), m3->getRemoteNode()->getPort());
+    DHTMessageHandle reply = p.first;
+
+    CPPUNIT_ASSERT(!reply.isNull());
+    CPPUNIT_ASSERT(tracker.getEntryFor(m3).isNull());
+    CPPUNIT_ASSERT_EQUAL((size_t)1, tracker.countEntry());
+  }
+  {
+    SharedHandle<Dictionary> res = new Dictionary();
+    res->put("t", new Data(m1->getTransactionID()));
+
+    std::pair<DHTMessageHandle, DHTMessageCallbackHandle> p = tracker.messageArrived(res.get(), "192.168.1.100", 6889);
+    DHTMessageHandle reply = p.first;
+
+    CPPUNIT_ASSERT(reply.isNull());
+  }
+}
+
+void DHTMessageTrackerTest::testHandleTimeout()
+{
+}