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/* <!-- 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 "DHTRoutingTableDeserializer.h"
#include <cerrno>
#include <cstring>
#include <cassert>
#include <istream>
#include <utility>
#include "DHTNode.h"
#include "DHTConstants.h"
#include "bittorrent_helper.h"
#include "DlAbortEx.h"
#include "Logger.h"
#include "a2netcompat.h"
#include "StringFormat.h"
#include "util.h"
#include "array_fun.h"
namespace aria2 {
DHTRoutingTableDeserializer::DHTRoutingTableDeserializer(int family):
family_(family) {}
DHTRoutingTableDeserializer::~DHTRoutingTableDeserializer() {}
static void readBytes(unsigned char* buf, size_t buflen,
std::istream& in, size_t readlen)
{
assert(readlen <= buflen);
in.read(reinterpret_cast<char*>(buf), readlen);
}
#define CHECK_STREAM(in, length) \
if(in.gcount() != length) { \
throw DL_ABORT_EX \
(StringFormat("Failed to load DHT routing table. cause:%s", \
"Unexpected EOF").str()); \
} \
if(!in) { \
throw DL_ABORT_EX \
(StringFormat("Failed to load DHT routing table. cause:%s", \
strerror(errno)).str()); \
}
void DHTRoutingTableDeserializer::deserialize(std::istream& in)
{
char header[8];
memset(header, 0, sizeof(header));
// magic
header[0] = 0xa1u;
header[1] = 0xa2u;
// format ID
header[2] = 0x02u;
// version
header[6] = 0;
header[7] = 0x03u;
char headerCompat[8];
memset(headerCompat, 0, sizeof(headerCompat));
// magic
headerCompat[0] = 0xa1u;
headerCompat[1] = 0xa2u;
// format ID
headerCompat[2] = 0x02u;
// version
headerCompat[6] = 0;
headerCompat[7] = 0x02u;
char zero[18];
memset(zero, 0, sizeof(zero));
int version;
// If you change the code to read more than the size of buf, then
// expand the buf size here.
array_wrapper<unsigned char, 255> buf;
// header
readBytes(buf, buf.size(), in, 8);
CHECK_STREAM(in, 8);
if(memcmp(header, buf, 8) == 0) {
version = 3;
} else if(memcmp(headerCompat, buf, 8) == 0) {
version = 2;
} else {
throw DL_ABORT_EX
(StringFormat("Failed to load DHT routing table. cause:%s",
"bad header").str());
}
uint32_t temp32;
uint64_t temp64;
// time
if(version == 2) {
in.read(reinterpret_cast<char*>(&temp32), sizeof(temp32));
CHECK_STREAM(in, sizeof(temp32));
serializedTime_.setTimeInSec(ntohl(temp32));
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
} else {
in.read(reinterpret_cast<char*>(&temp64), sizeof(temp64));
CHECK_STREAM(in, sizeof(temp64));
serializedTime_.setTimeInSec(ntoh64(temp64));
}
// localnode
// 8bytes reserved
readBytes(buf, buf.size(), in, 8);
CHECK_STREAM(in, 8);
// localnode ID
readBytes(buf, buf.size(), in, DHT_ID_LENGTH);
CHECK_STREAM(in, DHT_ID_LENGTH);
SharedHandle<DHTNode> localNode(new DHTNode(buf));
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
// number of nodes
in.read(reinterpret_cast<char*>(&temp32), sizeof(temp32));
CHECK_STREAM(in, sizeof(temp32));
uint32_t numNodes = ntohl(temp32);
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
std::vector<SharedHandle<DHTNode> > nodes;
// nodes
const int compactlen = bittorrent::getCompactLength(family_);
for(size_t i = 0; i < numNodes; ++i) {
// 1byte compact peer info length
uint8_t peerInfoLen;
in >> peerInfoLen;
if(peerInfoLen != compactlen) {
// skip this entry
readBytes(buf, buf.size(), in, 7+48);
CHECK_STREAM(in, 7+48);
continue;
}
// 7bytes reserved
readBytes(buf, buf.size(), in, 7);
CHECK_STREAM(in, 7);
// compactlen bytes compact peer info
readBytes(buf, buf.size(), in, compactlen);
CHECK_STREAM(in, compactlen);
if(memcmp(zero, buf, compactlen) == 0) {
// skip this entry
readBytes(buf, buf.size(), in, 48-compactlen);
CHECK_STREAM(in, 48-compactlen);
continue;
}
std::pair<std::string, uint16_t> peer =
bittorrent::unpackcompact(buf, family_);
if(peer.first.empty()) {
// skip this entry
readBytes(buf, buf.size(), in, 48-compactlen);
CHECK_STREAM(in, 48-compactlen);
continue;
}
// 24-compactlen bytes reserved
readBytes(buf, buf.size(), in, 24-compactlen);
// node ID
readBytes(buf, buf.size(), in, DHT_ID_LENGTH);
CHECK_STREAM(in, DHT_ID_LENGTH);
SharedHandle<DHTNode> node(new DHTNode(buf));
node->setIPAddress(peer.first);
node->setPort(peer.second);
// 4bytes reserved
readBytes(buf, buf.size(), in, 4);
CHECK_STREAM(in, 4);
nodes.push_back(node);
}
localNode_ = localNode;
nodes_ = nodes;
}
} // namespace aria2
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