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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 "DHTUtil.h"
#include "PeerMessageUtil.h"
#include "DlAbortEx.h"
#include "DHTConstants.h"
#include "MessageDigestHelper.h"
#include <cstring>
namespace aria2 {
DHTTokenTracker::DHTTokenTracker()
{
DHTUtil::generateRandomData(_secret[0], SECRET_SIZE);
memcpy(_secret[1], _secret[0], SECRET_SIZE);
}
DHTTokenTracker::DHTTokenTracker(const 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 char* secret) const
{
char src[DHT_ID_LENGTH+6+SECRET_SIZE];
if(!PeerMessageUtil::createcompact(src+DHT_ID_LENGTH, ipaddr, port)) {
throw new DlAbortEx("Token generation failed: ipaddr=%s, port=%u",
ipaddr.c_str(), port);
}
memcpy(src, infoHash, DHT_ID_LENGTH);
memcpy(src+DHT_ID_LENGTH+6, secret, SECRET_SIZE);
unsigned char md[20];
MessageDigestHelper::digest(md, sizeof(md), "sha1", 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(int i = 0; i < 2; ++i) {
if(generateToken(infoHash, ipaddr, port, _secret[i]) == token) {
return true;
}
}
return false;
}
void DHTTokenTracker::updateTokenSecret()
{
memcpy(_secret[1], _secret[0], SECRET_SIZE);
DHTUtil::generateRandomData(_secret[0], SECRET_SIZE);
}
} // namespace aria2
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