mirror of https://github.com/aria2/aria2
102 lines
3.4 KiB
C++
102 lines
3.4 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 "DHTTokenTracker.h"
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#include "DHTUtil.h"
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#include "PeerMessageUtil.h"
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#include "DlAbortEx.h"
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#include "DHTConstants.h"
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#include "MessageDigestHelper.h"
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#include "StringFormat.h"
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#include <cstring>
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namespace aria2 {
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DHTTokenTracker::DHTTokenTracker()
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{
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DHTUtil::generateRandomData(_secret[0], SECRET_SIZE);
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memcpy(_secret[1], _secret[0], SECRET_SIZE);
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}
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DHTTokenTracker::DHTTokenTracker(const unsigned char* initialSecret)
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{
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memcpy(_secret[0], initialSecret, SECRET_SIZE);
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memcpy(_secret[1], initialSecret, SECRET_SIZE);
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}
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DHTTokenTracker::~DHTTokenTracker() {}
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std::string DHTTokenTracker::generateToken(const unsigned char* infoHash,
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const std::string& ipaddr, uint16_t port,
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const unsigned char* secret) const
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{
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unsigned char src[DHT_ID_LENGTH+6+SECRET_SIZE];
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if(!PeerMessageUtil::createcompact(src+DHT_ID_LENGTH, ipaddr, port)) {
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throw DlAbortEx
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(StringFormat("Token generation failed: ipaddr=%s, port=%u",
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ipaddr.c_str(), port).str());
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}
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memcpy(src, infoHash, DHT_ID_LENGTH);
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memcpy(src+DHT_ID_LENGTH+6, secret, SECRET_SIZE);
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unsigned char md[20];
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MessageDigestHelper::digest(md, sizeof(md), MessageDigestContext::SHA1, src, sizeof(src));
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return std::string(&md[0], &md[sizeof(md)]);
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}
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std::string DHTTokenTracker::generateToken(const unsigned char* infoHash,
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const std::string& ipaddr, uint16_t port) const
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{
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return generateToken(infoHash, ipaddr, port, _secret[0]);
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}
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bool DHTTokenTracker::validateToken(const std::string& token,
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const unsigned char* infoHash,
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const std::string& ipaddr, uint16_t port) const
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{
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for(int i = 0; i < 2; ++i) {
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if(generateToken(infoHash, ipaddr, port, _secret[i]) == token) {
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return true;
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}
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}
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return false;
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}
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void DHTTokenTracker::updateTokenSecret()
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{
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memcpy(_secret[1], _secret[0], SECRET_SIZE);
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DHTUtil::generateRandomData(_secret[0], SECRET_SIZE);
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}
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} // namespace aria2
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