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, 91 insertions, 0 deletions

diff --git a/src/DHTConnectionImpl.cc b/src/DHTConnectionImpl.cc
new file mode 100644
index 00000000..605b2d54
--- /dev/null
+++ b/src/DHTConnectionImpl.cc
@@ -0,0 +1,91 @@
+/* <!-- 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 "DHTConnectionImpl.h"
+#include "LogFactory.h"
+#include "RecoverableException.h"
+#include "Util.h"
+DHTConnectionImpl::DHTConnectionImpl():_socket(new SocketCore(SOCK_DGRAM)),
+				       _logger(LogFactory::getInstance()) {}
+
+DHTConnectionImpl::~DHTConnectionImpl() {}
+
+uint16_t DHTConnectionImpl::bind(IntSequence& ports)
+{
+  while(ports.hasNext()) {
+    uint16_t port = bind(ports.next());
+    if(port > 0) {
+      return port;
+    }
+  }
+  return 0;
+}
+
+uint16_t DHTConnectionImpl::bind(uint16_t port)
+{
+  try {
+    _socket->bind(port);
+    pair<string, int32_t> svaddr;
+    _socket->getAddrInfo(svaddr);
+    _logger->info("Bind socket for DHT. port=%u", port);
+    return svaddr.second;
+  } catch(RecoverableException* e) {
+    _logger->error("Failed to bind for DHT. port=%u", e, port);
+    delete e;
+  }
+  return 0;
+}
+
+ssize_t DHTConnectionImpl::receiveMessage(char* data, size_t len, string& host, uint16_t& port)
+{
+  if(_socket->isReadable(0)) {
+    pair<string, uint16_t> remoteHost;
+    ssize_t length = _socket->readDataFrom(data, len, remoteHost);
+    host = remoteHost.first;
+    port = remoteHost.second;
+    return length;
+  } else {
+    return -1;
+  }
+}
+
+void DHTConnectionImpl::sendMessage(const char* data, size_t len, const string& host, uint16_t port)
+{
+  _socket->writeData(data, len, host, port);
+}
+
+SocketHandle DHTConnectionImpl::getSocket() const
+{
+  return _socket;
+}