mirror of https://github.com/aria2/aria2
147 lines
4.9 KiB
C++
147 lines
4.9 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "DHTGetPeersReplyMessage.h"
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#include <cstring>
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#include "DHTNode.h"
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#include "DHTBucket.h"
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#include "DHTRoutingTable.h"
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#include "DHTMessageFactory.h"
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#include "DHTMessageDispatcher.h"
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#include "DHTMessageCallback.h"
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#include "bittorrent_helper.h"
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#include "Peer.h"
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#include "DHTUtil.h"
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#include "Util.h"
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#include "bencode.h"
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#include "a2functional.h"
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namespace aria2 {
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const std::string DHTGetPeersReplyMessage::GET_PEERS("get_peers");
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const std::string DHTGetPeersReplyMessage::TOKEN("token");
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const std::string DHTGetPeersReplyMessage::VALUES("values");
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const std::string DHTGetPeersReplyMessage::NODES("nodes");
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DHTGetPeersReplyMessage::DHTGetPeersReplyMessage(const SharedHandle<DHTNode>& localNode,
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const SharedHandle<DHTNode>& remoteNode,
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const std::string& token,
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const std::string& transactionID):
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DHTResponseMessage(localNode, remoteNode, transactionID),
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_token(token) {}
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DHTGetPeersReplyMessage::~DHTGetPeersReplyMessage() {}
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void DHTGetPeersReplyMessage::doReceivedAction()
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{
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// Returned peers and nodes are handled in DHTPeerLookupTask.
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}
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BDE DHTGetPeersReplyMessage::getResponse()
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{
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BDE rDict = BDE::dict();
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rDict[DHTMessage::ID] = BDE(_localNode->getID(), DHT_ID_LENGTH);
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rDict[TOKEN] = _token;
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if(_values.empty()) {
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size_t offset = 0;
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unsigned char buffer[DHTBucket::K*26];
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for(std::deque<SharedHandle<DHTNode> >::const_iterator i =
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_closestKNodes.begin();
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i != _closestKNodes.end() && offset < DHTBucket::K*26; ++i) {
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SharedHandle<DHTNode> node = *i;
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memcpy(buffer+offset, node->getID(), DHT_ID_LENGTH);
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if(bittorrent::createcompact
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(buffer+20+offset, node->getIPAddress(), node->getPort())) {
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offset += 26;
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}
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}
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rDict[NODES] = BDE(buffer, offset);
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} else {
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// Limit the size of values list. The maxmum payload size of UDP
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// packet is limited to 65507bytes. aria2 uses 20bytes token and
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// 2byte transaction ID. The size of get_peers reply message
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// without values list is 87bytes:
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//
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// d1:rd2:id20:aaaaaaaaaaaaaaaaaaaa5:token20:aaaaaaaaaaaaaaaaaaaa
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// 6:valueslee1:t2:bb1:y1:re
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//
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// With this configuration, We can send (65507-87)/8 = 8177
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// values. Since the size of token and transaction ID may vary in
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// implementations, we use 8100.
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static const size_t MAX_VALUES_SIZE = 8100;
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BDE valuesList = BDE::list();
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for(std::deque<SharedHandle<Peer> >::const_iterator i = _values.begin();
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i != _values.end() && valuesList.size() < MAX_VALUES_SIZE; ++i) {
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const SharedHandle<Peer>& peer = *i;
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unsigned char buffer[6];
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if(bittorrent::createcompact(buffer, peer->ipaddr, peer->port)) {
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valuesList << BDE(buffer, sizeof(buffer));
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}
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}
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rDict[VALUES] = valuesList;
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}
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return rDict;
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}
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std::string DHTGetPeersReplyMessage::getMessageType() const
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{
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return GET_PEERS;
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}
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void DHTGetPeersReplyMessage::validate() const {}
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void DHTGetPeersReplyMessage::setClosestKNodes(const std::deque<SharedHandle<DHTNode> >& closestKNodes)
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{
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_closestKNodes = closestKNodes;
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}
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void DHTGetPeersReplyMessage::setValues(const std::deque<SharedHandle<Peer> >& peers)
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{
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_values = peers;
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}
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std::string DHTGetPeersReplyMessage::toStringOptional() const
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{
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return strconcat("token=", Util::toHex(_token),
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", values=", Util::uitos(_values.size()),
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", nodes=", Util::uitos(_closestKNodes.size()));
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}
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} // namespace aria2
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