mirror of https://github.com/aria2/aria2
136 lines
4.1 KiB
C++
136 lines
4.1 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 "DHTRoutingTableSerializer.h"
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#include <cstring>
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#include <ostream>
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#include "DHTNode.h"
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#include "DlAbortEx.h"
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#include "DHTConstants.h"
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#include "bittorrent_helper.h"
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#include "Logger.h"
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#include "a2netcompat.h"
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#include "util.h"
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#include "TimeA2.h"
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namespace aria2 {
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DHTRoutingTableSerializer::DHTRoutingTableSerializer(int family):
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family_(family) {}
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DHTRoutingTableSerializer::~DHTRoutingTableSerializer() {}
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void DHTRoutingTableSerializer::setLocalNode
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(const SharedHandle<DHTNode>& localNode)
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{
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localNode_ = localNode;
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}
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void DHTRoutingTableSerializer::setNodes
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(const std::vector<SharedHandle<DHTNode> >& nodes)
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{
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nodes_ = nodes;
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}
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void DHTRoutingTableSerializer::serialize(std::ostream& o)
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{
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char header[8];
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memset(header, 0, sizeof(header));
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// magic
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header[0] = 0xa1u;
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header[1] = 0xa2u;
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// format ID
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header[2] = 0x02u;
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// version
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header[6] = 0;
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header[7] = 0x03u;
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char zero[18];
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memset(zero, 0, sizeof(zero));
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o.write(header, 8);
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// write save date
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uint64_t ntime = hton64(Time().getTime());
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o.write(reinterpret_cast<const char*>(&ntime), sizeof(ntime));
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// localnode
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// 8bytes reserved
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o.write(zero, 8);
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// 20bytes localnode ID
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o.write(reinterpret_cast<const char*>(localNode_->getID()), DHT_ID_LENGTH);
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// 4bytes reserved
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o.write(zero, 4);
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// number of nodes
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uint32_t numNodes = htonl(nodes_.size());
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o.write(reinterpret_cast<const char*>(&numNodes), sizeof(uint32_t));
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// 4bytes reserved
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o.write(zero, 4);
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const int clen = bittorrent::getCompactLength(family_);
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// nodes
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for(std::vector<SharedHandle<DHTNode> >::const_iterator i = nodes_.begin(),
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eoi = nodes_.end(); i != eoi; ++i) {
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const SharedHandle<DHTNode>& node = *i;
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// Write IP address + port in Compact IP-address/port info form.
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unsigned char compactPeer[COMPACT_LEN_IPV6];
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int compactlen = bittorrent::packcompact
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(compactPeer, node->getIPAddress(), node->getPort());
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if(compactlen != clen) {
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memset(compactPeer, 0, clen);
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}
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// 1byte compact peer format length
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o << static_cast<uint8_t>(clen);
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// 7bytes reserved
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o.write(zero, 7);
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// clen bytes compact peer
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o.write(reinterpret_cast<const char*>(compactPeer), clen);
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// 24-clen bytes reserved
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o.write(zero, 24-clen);
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// 20bytes: node ID
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o.write(reinterpret_cast<const char*>(node->getID()), DHT_ID_LENGTH);
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// 4bytes reserved
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o.write(zero, 4);
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}
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o.flush();
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if(!o) {
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throw DL_ABORT_EX("Failed to save DHT routing table.");
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}
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}
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} // namespace aria2
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