2010-02-20 Tatsuhiro Tsujikawa <t-tujikawa@users.sourceforge.net>

	Added Local Peer Discovery. It is disabled by default. Use
	--bt-enable-lpd to enable the function.
	* src/BtConstants.h
	* src/BtSetup.cc
	* src/LpdDispatchMessageCommand.cc
	* src/LpdDispatchMessageCommand.h
	* src/LpdMessage.h
	* src/LpdMessageDispatcher.cc
	* src/LpdMessageDispatcher.h
	* src/LpdMessageReceiver.cc
	* src/LpdMessageReceiver.h
	* src/LpdReceiveMessageCommand.cc
	* src/LpdReceiveMessageCommand.h
	* src/Makefile.am
	* src/OptionHandlerFactory.cc
	* src/Peer.cc
	* src/Peer.h
	* src/PeerInteractionCommand.cc
	* src/SocketCore.cc
	* src/SocketCore.h
	* src/prefs.cc
	* src/prefs.h
	* src/usage_text.h
	* src/util.cc
	* src/util.h
	* test/LpdMessageDispatcherTest.cc
	* test/LpdMessageReceiverTest.cc
	* test/Makefile.am

1 files changed, 107 insertions, 0 deletions

diff --git a/src/LpdMessageReceiver.cc b/src/LpdMessageReceiver.cc
new file mode 100644
index 00000000..3d9567f2
--- /dev/null
+++ b/src/LpdMessageReceiver.cc
@@ -0,0 +1,107 @@
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 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.
+ */
+#include "LpdMessageReceiver.h"
+#include "SocketCore.h"
+#include "Logger.h"
+#include "LogFactory.h"
+#include "HttpHeaderProcessor.h"
+#include "HttpHeader.h"
+#include "util.h"
+#include "LpdMessage.h"
+#include "RecoverableException.h"
+
+namespace aria2 {
+
+LpdMessageReceiver::LpdMessageReceiver
+(const std::string& multicastAddress, uint16_t multicastPort):
+  _multicastAddress(multicastAddress),
+  _multicastPort(multicastPort),
+  _logger(LogFactory::getInstance()) {}
+
+bool LpdMessageReceiver::init()
+{
+  try {
+    _socket.reset(new SocketCore(SOCK_DGRAM));
+    // SocketCore::bind(port, flags) cannot be used here, because it
+    // is affected by --interface option.
+    _socket->bindWithFamily(_multicastPort, AF_INET);
+    _socket->joinMulticastGroup(_multicastAddress, _multicastPort);
+    _socket->setNonBlockingMode();
+    _logger->info("Listening multicast group (%s:%u) packet",
+                  _multicastAddress.c_str(), _multicastPort);
+    return true;
+  } catch(RecoverableException& e) {
+    _logger->error("Failed to initialize LPD message receiver.", e);
+  }
+  return false;
+}
+
+SharedHandle<LpdMessage> LpdMessageReceiver::receiveMessage()
+{
+  SharedHandle<LpdMessage> msg;
+  try {
+    unsigned char buf[200];
+    std::pair<std::string, uint16_t> peerAddr;
+    ssize_t length = _socket->readDataFrom(buf, sizeof(buf), peerAddr);
+    if(length == 0) {
+      return msg;
+    }
+    HttpHeaderProcessor proc;
+    proc.update(buf, length);
+    if(!proc.eoh()) {
+      return msg;
+    }
+    SharedHandle<HttpHeader> header = proc.getHttpRequestHeader();
+    std::string infoHashString = header->getFirst("Infohash");
+    uint16_t port = header->getFirstAsUInt("Port");
+    _logger->info("LPD message received infohash=%s, port=%u from %s",
+                  infoHashString.c_str(), port, peerAddr.first.c_str());
+    std::string infoHash;
+    if(infoHashString.size() != 40 ||
+       (infoHash = util::fromHex(infoHashString)).empty() ||
+       port == 0) {
+      _logger->info("LPD bad request. infohash=%s", infoHashString.c_str());
+      return msg;
+    }
+    SharedHandle<Peer> peer(new Peer(peerAddr.first, port, false));
+    if(util::inPrivateAddress(peerAddr.first)) {
+      peer->setLocalPeer(true);
+    }
+    msg.reset(new LpdMessage(peer, infoHash));
+  } catch(RecoverableException& e) {
+    _logger->info("Failed to receive LPD message.", e);
+  }
+  return msg;
+}
+
+} // namespace aria2