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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 "DHTTokenTracker.h"
#include <cstring>
#include "util.h"
#include "bittorrent_helper.h"
#include "DlAbortEx.h"
#include "DHTConstants.h"
#include "MessageDigest.h"
#include "message_digest_helper.h"
#include "fmt.h"
namespace aria2 {
DHTTokenTracker::DHTTokenTracker()
{
util::generateRandomData(secret_[0], SECRET_SIZE);
memcpy(secret_[1], secret_[0], SECRET_SIZE);
}
DHTTokenTracker::DHTTokenTracker(const unsigned char* initialSecret)
{
memcpy(secret_[0], initialSecret, SECRET_SIZE);
memcpy(secret_[1], initialSecret, SECRET_SIZE);
}
DHTTokenTracker::~DHTTokenTracker() {}
std::string DHTTokenTracker::generateToken(const unsigned char* infoHash,
const std::string& ipaddr,
uint16_t port,
const unsigned char* secret) const
{
unsigned char src[DHT_ID_LENGTH + COMPACT_LEN_IPV6 + SECRET_SIZE];
memset(src, 0, sizeof(src));
int compactlen = bittorrent::packcompact(src + DHT_ID_LENGTH, ipaddr, port);
if (compactlen == 0) {
throw DL_ABORT_EX(fmt("Token generation failed: ipaddr=%s, port=%u",
ipaddr.c_str(), port));
}
memcpy(src, infoHash, DHT_ID_LENGTH);
memcpy(src + DHT_ID_LENGTH + COMPACT_LEN_IPV6, secret, SECRET_SIZE);
unsigned char md[20];
message_digest::digest(md, sizeof(md), MessageDigest::sha1().get(), src,
sizeof(src));
return std::string(&md[0], &md[sizeof(md)]);
}
std::string DHTTokenTracker::generateToken(const unsigned char* infoHash,
const std::string& ipaddr,
uint16_t port) const
{
return generateToken(infoHash, ipaddr, port, secret_[0]);
}
bool DHTTokenTracker::validateToken(const std::string& token,
const unsigned char* infoHash,
const std::string& ipaddr,
uint16_t port) const
{
for (auto& elem : secret_) {
if (generateToken(infoHash, ipaddr, port, elem) == token) {
return true;
}
}
return false;
}
void DHTTokenTracker::updateTokenSecret()
{
memcpy(secret_[1], secret_[0], SECRET_SIZE);
util::generateRandomData(secret_[0], SECRET_SIZE);
}
} // namespace aria2
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