danicoin/src/cryptonote_basic/checkpoints.cpp
2018-01-29 19:32:05 +01:00

235 lines
8 KiB
C++

// Copyright (c) 2014-2017, The Monero Project, The Danicoin Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include "include_base_utils.h"
using namespace epee;
#include "checkpoints.h"
#include "common/dns_utils.h"
#include "include_base_utils.h"
#include <sstream>
#include <random>
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "checkpoints"
namespace cryptonote
{
//---------------------------------------------------------------------------
checkpoints::checkpoints()
{
}
//---------------------------------------------------------------------------
bool checkpoints::add_checkpoint(uint64_t height, const std::string& hash_str)
{
crypto::hash h = null_hash;
bool r = epee::string_tools::parse_tpod_from_hex_string(hash_str, h);
CHECK_AND_ASSERT_MES(r, false, "Failed to parse checkpoint hash string into binary representation!");
// return false if adding at a height we already have AND the hash is different
if (m_points.count(height))
{
CHECK_AND_ASSERT_MES(h == m_points[height], false, "Checkpoint at given height already exists, and hash for new checkpoint was different!");
}
m_points[height] = h;
return true;
}
//---------------------------------------------------------------------------
bool checkpoints::is_in_checkpoint_zone(uint64_t height) const
{
return !m_points.empty() && (height <= (--m_points.end())->first);
}
//---------------------------------------------------------------------------
bool checkpoints::check_block(uint64_t height, const crypto::hash& h, bool& is_a_checkpoint) const
{
auto it = m_points.find(height);
is_a_checkpoint = it != m_points.end();
if(!is_a_checkpoint)
return true;
if(it->second == h)
{
MINFO("CHECKPOINT PASSED FOR HEIGHT " << height << " " << h);
return true;
}else
{
MWARNING("CHECKPOINT FAILED FOR HEIGHT " << height << ". EXPECTED HASH: " << it->second << ", FETCHED HASH: " << h);
return false;
}
}
//---------------------------------------------------------------------------
bool checkpoints::check_block(uint64_t height, const crypto::hash& h) const
{
bool ignored;
return check_block(height, h, ignored);
}
//---------------------------------------------------------------------------
//FIXME: is this the desired behavior?
bool checkpoints::is_alternative_block_allowed(uint64_t blockchain_height, uint64_t block_height) const
{
if (0 == block_height)
return false;
auto it = m_points.upper_bound(blockchain_height);
// Is blockchain_height before the first checkpoint?
if (it == m_points.begin())
return true;
--it;
uint64_t checkpoint_height = it->first;
return checkpoint_height < block_height;
}
//---------------------------------------------------------------------------
uint64_t checkpoints::get_max_height() const
{
std::map< uint64_t, crypto::hash >::const_iterator highest =
std::max_element( m_points.begin(), m_points.end(),
( boost::bind(&std::map< uint64_t, crypto::hash >::value_type::first, _1) <
boost::bind(&std::map< uint64_t, crypto::hash >::value_type::first, _2 ) ) );
return highest->first;
}
//---------------------------------------------------------------------------
const std::map<uint64_t, crypto::hash>& checkpoints::get_points() const
{
return m_points;
}
bool checkpoints::check_for_conflicts(const checkpoints& other) const
{
for (auto& pt : other.get_points())
{
if (m_points.count(pt.first))
{
CHECK_AND_ASSERT_MES(pt.second == m_points.at(pt.first), false, "Checkpoint at given height already exists, and hash for new checkpoint was different!");
}
}
return true;
}
bool checkpoints::init_default_checkpoints()
{
/* ADD_CHECKPOINT(1, "771fbcd656ec1464d3a02ead5e18644030007a0fc664c0a964d30922821a8148"); */
return true;
}
bool checkpoints::load_checkpoints_from_json(const std::string json_hashfile_fullpath)
{
boost::system::error_code errcode;
if (! (boost::filesystem::exists(json_hashfile_fullpath, errcode)))
{
LOG_PRINT_L1("Blockchain checkpoints file not found");
return true;
}
LOG_PRINT_L1("Adding checkpoints from blockchain hashfile");
uint64_t prev_max_height = get_max_height();
LOG_PRINT_L1("Hard-coded max checkpoint height is " << prev_max_height);
t_hash_json hashes;
epee::serialization::load_t_from_json_file(hashes, json_hashfile_fullpath);
for (std::vector<t_hashline>::const_iterator it = hashes.hashlines.begin(); it != hashes.hashlines.end(); )
{
uint64_t height;
height = it->height;
if (height <= prev_max_height) {
LOG_PRINT_L1("ignoring checkpoint height " << height);
} else {
std::string blockhash = it->hash;
LOG_PRINT_L1("Adding checkpoint height " << height << ", hash=" << blockhash);
ADD_CHECKPOINT(height, blockhash);
}
++it;
}
return true;
}
bool checkpoints::load_checkpoints_from_dns(bool testnet)
{
std::vector<std::string> records;
// All four MoneroPulse domains have DNSSEC on and valid
static const std::vector<std::string> dns_urls = { "node1.danico.in"
, "node2.danico.in"
};
static const std::vector<std::string> testnet_dns_urls = {
};
if (!tools::dns_utils::load_txt_records_from_dns(records, testnet ? testnet_dns_urls : dns_urls))
return true; // why true ?
for (const auto& record : records)
{
auto pos = record.find(":");
if (pos != std::string::npos)
{
uint64_t height;
crypto::hash hash;
// parse the first part as uint64_t,
// if this fails move on to the next record
std::stringstream ss(record.substr(0, pos));
if (!(ss >> height))
{
continue;
}
// parse the second part as crypto::hash,
// if this fails move on to the next record
std::string hashStr = record.substr(pos + 1);
if (!epee::string_tools::parse_tpod_from_hex_string(hashStr, hash))
{
continue;
}
ADD_CHECKPOINT(height, hashStr);
}
}
return true;
}
bool checkpoints::load_new_checkpoints(const std::string json_hashfile_fullpath, bool testnet, bool dns)
{
bool result;
result = load_checkpoints_from_json(json_hashfile_fullpath);
if (dns)
{
result &= load_checkpoints_from_dns(testnet);
}
return result;
}
}