BtHandshakeMessageValidator.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2010 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 "BtHandshakeMessageValidator.h"

#include <cstring>

#include "BtHandshakeMessage.h"
#include "util.h"
#include "DlAbortEx.h"
#include "fmt.h"

namespace aria2 {

BtHandshakeMessageValidator::BtHandshakeMessageValidator(
    const BtHandshakeMessage* message, const unsigned char* infoHash)
    : message_(message)
{
  memcpy(infoHash_, infoHash, sizeof(infoHash_));
}

BtHandshakeMessageValidator::~BtHandshakeMessageValidator() = default;

void BtHandshakeMessageValidator::validate()
{
  if (message_->getPstrlen() != 19) {
    throw DL_ABORT_EX(
        fmt("invalid handshake pstrlen=%u", message_->getPstrlen()));
  }
  if (memcmp(BtHandshakeMessage::BT_PSTR, message_->getPstr(), 19) != 0) {
    throw DL_ABORT_EX(
        fmt("invalid handshake pstr=%s",
            util::percentEncode(message_->getPstr(), 19).c_str()));
  }
  if (memcmp(infoHash_, message_->getInfoHash(), sizeof(infoHash_)) != 0) {
    throw DL_ABORT_EX(
        fmt("invalid handshake info hash: expected:%s, actual:%s",
            util::toHex(infoHash_, sizeof(infoHash_)).c_str(),
            util::toHex(message_->getInfoHash(), INFO_HASH_LENGTH).c_str()));
  }
}

} // namespace aria2