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// Copyright (c) 2018-2024, The Monero 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.
#include <boost/archive/portable_binary_iarchive.hpp>
#include <boost/filesystem.hpp>
#include "cryptonote_config.h"
#include "include_base_utils.h"
#include "string_tools.h"
#include "file_io_utils.h"
#include "int-util.h"
#include "common/util.h"
#include "common/unordered_containers_boost_serialization.h"
#include "cryptonote_basic/cryptonote_boost_serialization.h"
#include "cryptonote_basic/cryptonote_format_utils.h"
#include "cryptonote_basic/difficulty.h"
#include "core_rpc_server_error_codes.h"
#include "rpc_payment.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "daemon.rpc.payment"
#define STALE_THRESHOLD 15 /* seconds */
#define PENALTY_FOR_STALE 0
#define PENALTY_FOR_BAD_HASH 20
#define PENALTY_FOR_DUPLICATE 20
#define DEFAULT_FLUSH_AGE (3600 * 24 * 180) // half a year
#define DEFAULT_ZERO_FLUSH_AGE (60 * 2) // 2 minutes
namespace cryptonote
{
rpc_payment::client_info::client_info():
previous_seed_height(0),
seed_height(0),
previous_seed_hash(crypto::null_hash),
seed_hash(crypto::null_hash),
cookie(0),
top(crypto::null_hash),
previous_top(crypto::null_hash),
credits(0),
update_time(time(NULL)),
last_request_timestamp(0),
block_template_update_time(0),
credits_total(0),
credits_used(0),
nonces_good(0),
nonces_stale(0),
nonces_bad(0),
nonces_dupe(0)
{
}
rpc_payment::rpc_payment(const cryptonote::account_public_address &address, uint64_t diff, uint64_t credits_per_hash_found):
m_address(address),
m_diff(diff),
m_credits_per_hash_found(credits_per_hash_found),
m_credits_total(0),
m_credits_used(0),
m_nonces_good(0),
m_nonces_stale(0),
m_nonces_bad(0),
m_nonces_dupe(0)
{
}
uint64_t rpc_payment::balance(const crypto::public_key &client, int64_t delta)
{
boost::lock_guard<boost::mutex> lock(mutex);
client_info &info = m_client_info[client]; // creates if not found
uint64_t credits = info.credits;
if (delta > 0 && credits > std::numeric_limits<uint64_t>::max() - delta)
credits = std::numeric_limits<uint64_t>::max();
else if (delta < 0 && credits < (uint64_t)-delta)
credits = 0;
else
credits += delta;
if (delta)
MINFO("Client " << client << ": balance change from " << info.credits << " to " << credits);
return info.credits = credits;
}
bool rpc_payment::pay(const crypto::public_key &client, uint64_t ts, uint64_t payment, const std::string &rpc, bool same_ts, uint64_t &credits)
{
boost::lock_guard<boost::mutex> lock(mutex);
client_info &info = m_client_info[client]; // creates if not found
if (ts < info.last_request_timestamp || (ts == info.last_request_timestamp && !same_ts))
{
MDEBUG("Invalid ts: " << ts << " <= " << info.last_request_timestamp);
return false;
}
info.last_request_timestamp = ts;
if (info.credits < payment)
{
MDEBUG("Not enough credits: " << info.credits << " < " << payment);
credits = info.credits;
return false;
}
info.credits -= payment;
add64clamp(&info.credits_used, payment);
add64clamp(&m_credits_used, payment);
MDEBUG("client " << client << " paying " << payment << " for " << rpc << ", " << info.credits << " left");
credits = info.credits;
return true;
}
bool rpc_payment::get_info(const crypto::public_key &client, const std::function<bool(const cryptonote::blobdata&, cryptonote::block&, uint64_t &seed_height, crypto::hash &seed_hash)> &get_block_template, cryptonote::blobdata &hashing_blob, uint64_t &seed_height, crypto::hash &seed_hash, const crypto::hash &top, uint64_t &diff, uint64_t &credits_per_hash_found, uint64_t &credits, uint32_t &cookie)
{
boost::lock_guard<boost::mutex> lock(mutex);
client_info &info = m_client_info[client]; // creates if not found
const uint64_t now = time(NULL);
bool need_template = top != info.top || now >= info.block_template_update_time + STALE_THRESHOLD;
if (need_template)
{
cryptonote::block new_block;
uint64_t new_seed_height;
crypto::hash new_seed_hash;
cryptonote::blobdata extra_nonce("\x42\x42\x42\x42", 4);
if (!get_block_template(extra_nonce, new_block, new_seed_height, new_seed_hash))
return false;
if(!remove_field_from_tx_extra(new_block.miner_tx.extra, typeid(cryptonote::tx_extra_nonce)))
return false;
char data[33];
memcpy(data, &client, 32);
data[32] = config::HASH_KEY_RPC_PAYMENT_NONCE;
crypto::hash hash;
cn_fast_hash(data, sizeof(data), hash);
extra_nonce = cryptonote::blobdata((const char*)&hash, 4);
if(!add_extra_nonce_to_tx_extra(new_block.miner_tx.extra, extra_nonce))
return false;
info.previous_block = std::move(info.block);
info.block = std::move(new_block);
hashing_blob = get_block_hashing_blob(info.block);
info.previous_hashing_blob = info.hashing_blob;
info.hashing_blob = hashing_blob;
info.previous_top = info.top;
info.previous_seed_height = info.seed_height;
info.seed_height = new_seed_height;
info.previous_seed_hash = info.seed_hash;
info.seed_hash = new_seed_hash;
std::swap(info.previous_payments, info.payments);
info.payments.clear();
++info.cookie;
info.block_template_update_time = now;
}
info.top = top;
info.update_time = now;
hashing_blob = info.hashing_blob;
diff = m_diff;
credits_per_hash_found = m_credits_per_hash_found;
credits = info.credits;
seed_height = info.seed_height;
seed_hash = info.seed_hash;
cookie = info.cookie;
return true;
}
bool rpc_payment::submit_nonce(const crypto::public_key &client, uint32_t nonce, const crypto::hash &top, int64_t &error_code, std::string &error_message, uint64_t &credits, crypto::hash &hash, cryptonote::block &block, uint32_t cookie, bool &stale)
{
boost::lock_guard<boost::mutex> lock(mutex);
client_info &info = m_client_info[client]; // creates if not found
if (cookie != info.cookie && cookie != info.cookie - 1)
{
MWARNING("Very stale nonce");
++m_nonces_stale;
++info.nonces_stale;
sub64clamp(&info.credits, PENALTY_FOR_STALE * m_credits_per_hash_found);
error_code = CORE_RPC_ERROR_CODE_STALE_PAYMENT;
error_message = "Very stale payment";
return false;
}
const bool is_current = cookie == info.cookie;
MINFO("client " << client << " sends nonce: " << nonce << ", " << (is_current ? "current" : "stale"));
std::unordered_set<uint64_t> &payments = is_current ? info.payments : info.previous_payments;
if (!payments.insert(nonce).second)
{
MWARNING("Duplicate nonce " << nonce << " from " << (is_current ? "current" : "previous"));
++m_nonces_dupe;
++info.nonces_dupe;
sub64clamp(&info.credits, PENALTY_FOR_DUPLICATE * m_credits_per_hash_found);
error_code = CORE_RPC_ERROR_CODE_DUPLICATE_PAYMENT;
error_message = "Duplicate payment";
return false;
}
const uint64_t now = time(NULL);
if (!is_current)
{
if (now > info.update_time + STALE_THRESHOLD)
{
MWARNING("Nonce is stale (top " << top << ", should be " << info.top << " or within " << STALE_THRESHOLD << " seconds");
++m_nonces_stale;
++info.nonces_stale;
sub64clamp(&info.credits, PENALTY_FOR_STALE * m_credits_per_hash_found);
error_code = CORE_RPC_ERROR_CODE_STALE_PAYMENT;
error_message = "stale payment";
return false;
}
}
cryptonote::blobdata hashing_blob = is_current ? info.hashing_blob : info.previous_hashing_blob;
if (hashing_blob.size() < 43)
{
// not initialized ?
error_code = CORE_RPC_ERROR_CODE_WRONG_BLOCKBLOB;
error_message = "not initialized";
return false;
}
block = is_current ? info.block : info.previous_block;
*(uint32_t*)(hashing_blob.data() + 39) = SWAP32LE(nonce);
if (block.major_version >= RX_BLOCK_VERSION)
{
const crypto::hash &seed_hash = is_current ? info.seed_hash : info.previous_seed_hash;
crypto::rx_slow_hash(seed_hash.data, hashing_blob.data(), hashing_blob.size(), hash.data);
}
else
{
const int cn_variant = hashing_blob[0] >= 7 ? hashing_blob[0] - 6 : 0;
crypto::cn_slow_hash(hashing_blob.data(), hashing_blob.size(), hash, cn_variant, cryptonote::get_block_height(block));
}
if (!check_hash(hash, m_diff))
{
MWARNING("Payment too low");
++m_nonces_bad;
++info.nonces_bad;
error_code = CORE_RPC_ERROR_CODE_PAYMENT_TOO_LOW;
error_message = "Hash does not meet difficulty (could be wrong PoW hash, or mining at lower difficulty than required, or attempt to defraud)";
sub64clamp(&info.credits, PENALTY_FOR_BAD_HASH * m_credits_per_hash_found);
return false;
}
add64clamp(&info.credits, m_credits_per_hash_found);
MINFO("client " << client << " credited for " << m_credits_per_hash_found << ", now " << info.credits << (is_current ? "" : " (close)"));
m_hashrate[now] += m_diff;
add64clamp(&m_credits_total, m_credits_per_hash_found);
add64clamp(&info.credits_total, m_credits_per_hash_found);
++m_nonces_good;
++info.nonces_good;
credits = info.credits;
block = info.block;
block.nonce = nonce;
stale = !is_current;
return true;
}
bool rpc_payment::foreach(const std::function<bool(const crypto::public_key &client, const client_info &info)> &f) const
{
boost::lock_guard<boost::mutex> lock(mutex);
for (std::unordered_map<crypto::public_key, client_info>::const_iterator i = m_client_info.begin(); i != m_client_info.end(); ++i)
{
if (!f(i->first, i->second))
return false;
}
return true;
}
bool rpc_payment::load(std::string directory)
{
TRY_ENTRY();
boost::lock_guard<boost::mutex> lock(mutex);
m_directory = std::move(directory);
std::string state_file_path = m_directory + "/" + RPC_PAYMENTS_DATA_FILENAME;
MINFO("loading rpc payments data from " << state_file_path);
std::ifstream data;
data.open(state_file_path, std::ios_base::binary | std::ios_base::in);
std::string bytes(std::istream_iterator<char>{data}, std::istream_iterator<char>{});
if (!data.fail())
{
bool loaded = false;
try
{
binary_archive<false> ar{epee::strspan<std::uint8_t>(bytes)};
if (::serialization::serialize(ar, *this))
if (::serialization::check_stream_state(ar))
loaded = true;
}
catch (...) {}
if (!loaded)
{
bytes.clear();
bytes.shrink_to_fit();
try
{
boost::archive::portable_binary_iarchive a(data);
a >> *this;
loaded = true;
}
catch (...) {}
}
if (!loaded)
{
MERROR("Failed to load RPC payments file");
m_client_info.clear();
}
}
else
{
m_client_info.clear();
}
CATCH_ENTRY_L0("rpc_payment::load", false);
return true;
}
bool rpc_payment::store(const std::string &directory_) const
{
TRY_ENTRY();
boost::lock_guard<boost::mutex> lock(mutex);
const std::string &directory = directory_.empty() ? m_directory : directory_;
MDEBUG("storing rpc payments data to " << directory);
if (!tools::create_directories_if_necessary(directory))
{
MWARNING("Failed to create data directory: " << directory);
return false;
}
const boost::filesystem::path state_file_path = (boost::filesystem::path(directory) / RPC_PAYMENTS_DATA_FILENAME);
if (boost::filesystem::exists(state_file_path))
{
std::string state_file_path_old = state_file_path.string() + ".old";
boost::system::error_code ec;
boost::filesystem::remove(state_file_path_old, ec);
std::error_code e = tools::replace_file(state_file_path.string(), state_file_path_old);
if (e)
MWARNING("Failed to rename " << state_file_path << " to " << state_file_path_old << ": " << e);
}
std::ofstream data;
data.open(state_file_path.string(), std::ios_base::binary | std::ios_base::out | std::ios::trunc);
if (data.fail())
{
MWARNING("Failed to save RPC payments to file " << state_file_path);
return false;
};
binary_archive<true> ar(data);
if (!::serialization::serialize(ar, *const_cast<rpc_payment*>(this)))
return false;
return true;
CATCH_ENTRY_L0("rpc_payment::store", false);
}
unsigned int rpc_payment::flush_by_age(time_t seconds)
{
boost::lock_guard<boost::mutex> lock(mutex);
unsigned int count = 0;
const time_t now = time(NULL);
time_t seconds0 = seconds;
if (seconds == 0)
{
seconds = DEFAULT_FLUSH_AGE;
seconds0 = DEFAULT_ZERO_FLUSH_AGE;
}
const time_t threshold = seconds > now ? 0 : now - seconds;
const time_t threshold0 = seconds0 > now ? 0 : now - seconds0;
for (std::unordered_map<crypto::public_key, client_info>::iterator i = m_client_info.begin(); i != m_client_info.end(); )
{
std::unordered_map<crypto::public_key, client_info>::iterator j = i++;
const time_t t = std::max(j->second.last_request_timestamp / 1000000, j->second.update_time);
const bool erase = t < ((j->second.credits == 0) ? threshold0 : threshold);
if (erase)
{
MINFO("Erasing " << j->first << " with " << j->second.credits << " credits, inactive for " << (now-t)/86400 << " days");
m_client_info.erase(j);
++count;
}
}
return count;
}
uint64_t rpc_payment::get_hashes(unsigned int seconds) const
{
boost::lock_guard<boost::mutex> lock(mutex);
const uint64_t now = time(NULL);
uint64_t hashes = 0;
for (std::map<uint64_t, uint64_t>::const_reverse_iterator i = m_hashrate.crbegin(); i != m_hashrate.crend(); ++i)
{
if (now > i->first + seconds)
break;
hashes += i->second;
}
return hashes;
}
void rpc_payment::prune_hashrate(unsigned int seconds)
{
boost::lock_guard<boost::mutex> lock(mutex);
const uint64_t now = time(NULL);
std::map<uint64_t, uint64_t>::iterator i;
for (i = m_hashrate.begin(); i != m_hashrate.end(); ++i)
{
if (now <= i->first + seconds)
break;
}
m_hashrate.erase(m_hashrate.begin(), i);
}
bool rpc_payment::on_idle()
{
flush_by_age();
prune_hashrate(3600);
return true;
}
}
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