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// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
#include <arith_uint256.h>
#include <clientversion.h>
#include <coins.h>
#include <consensus/consensus.h>
#include <core_io.h>
#include <key_io.h>
#include <policy/rbf.h>
#include <primitives/transaction.h>
#include <script/script.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <univalue.h>
#include <util/moneystr.h>
#include <util/rbf.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/system.h>
#include <util/translation.h>
#include <functional>
#include <memory>
#include <stdio.h>
#include <thread>
#include <boost/algorithm/string.hpp>
static const int CONTINUE_EXECUTION=-1;
const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
static void SetupBitcoinUtilArgs(ArgsManager &argsman)
{
SetupHelpOptions(argsman);
argsman.AddArg("-version", "Print version and exit", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
SetupChainParamsBaseOptions(argsman);
}
// This function returns either one of EXIT_ codes when it's expected to stop the process or
// CONTINUE_EXECUTION when it's expected to continue further.
static int AppInitUtil(int argc, char* argv[])
{
SetupBitcoinUtilArgs(gArgs);
std::string error;
if (!gArgs.ParseParameters(argc, argv, error)) {
tfm::format(std::cerr, "Error parsing command line arguments: %s\n", error);
return EXIT_FAILURE;
}
// Check for chain settings (Params() calls are only valid after this clause)
try {
SelectParams(gArgs.GetChainName());
} catch (const std::exception& e) {
tfm::format(std::cerr, "Error: %s\n", e.what());
return EXIT_FAILURE;
}
if (argc < 2 || HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
// First part of help message is specific to this utility
std::string strUsage = PACKAGE_NAME " bitcoin-util utility version " + FormatFullVersion() + "\n";
if (!gArgs.IsArgSet("-version")) {
strUsage += "\n"
"Usage: bitcoin-util [options] [commands] Do stuff\n";
strUsage += "\n" + gArgs.GetHelpMessage();
}
tfm::format(std::cout, "%s", strUsage);
if (argc < 2) {
tfm::format(std::cerr, "Error: too few parameters\n");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
return CONTINUE_EXECUTION;
}
static void grind_task(uint32_t nBits, CBlockHeader& header_orig, uint32_t offset, uint32_t step, std::atomic<bool>& found)
{
arith_uint256 target;
bool neg, over;
target.SetCompact(nBits, &neg, &over);
if (target == 0 || neg || over) return;
CBlockHeader header = header_orig; // working copy
header.nNonce = offset;
uint32_t finish = std::numeric_limits<uint32_t>::max() - step;
finish = finish - (finish % step) + offset;
while (!found && header.nNonce < finish) {
const uint32_t next = (finish - header.nNonce < 5000*step) ? finish : header.nNonce + 5000*step;
do {
if (UintToArith256(header.GetHash()) <= target) {
if (!found.exchange(true)) {
header_orig.nNonce = header.nNonce;
}
return;
}
header.nNonce += step;
} while(header.nNonce != next);
}
}
static int Grind(int argc, char* argv[], std::string& strPrint)
{
if (argc != 1) {
strPrint = "Must specify block header to grind";
return 1;
}
CBlockHeader header;
if (!DecodeHexBlockHeader(header, argv[0])) {
strPrint = "Could not decode block header";
return 1;
}
uint32_t nBits = header.nBits;
std::atomic<bool> found{false};
std::vector<std::thread> threads;
int n_tasks = std::max(1u, std::thread::hardware_concurrency());
for (int i = 0; i < n_tasks; ++i) {
threads.emplace_back( grind_task, nBits, std::ref(header), i, n_tasks, std::ref(found) );
}
for (auto& t : threads) {
t.join();
}
if (!found) {
strPrint = "Could not satisfy difficulty target";
return 1;
}
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
ss << header;
strPrint = HexStr(ss);
return 0;
}
static int CommandLineUtil(int argc, char* argv[])
{
if (argc <= 1) return 1;
std::string strPrint;
int nRet = 0;
try {
while (argc > 1 && IsSwitchChar(argv[1][0]) && (argv[1][1] != 0)) {
--argc;
++argv;
}
char* command = argv[1];
if (strcmp(command, "grind") == 0) {
nRet = Grind(argc-2, argv+2, strPrint);
} else {
strPrint = strprintf("Unknown command %s", command);
nRet = 1;
}
}
catch (const std::exception& e) {
strPrint = std::string("error: ") + e.what();
nRet = EXIT_FAILURE;
}
catch (...) {
PrintExceptionContinue(nullptr, "CommandLineUtil()");
throw;
}
if (strPrint != "") {
tfm::format(nRet == 0 ? std::cout : std::cerr, "%s\n", strPrint);
}
return nRet;
}
int main(int argc, char* argv[])
{
SetupEnvironment();
try {
int ret = AppInitUtil(argc, argv);
if (ret != CONTINUE_EXECUTION)
return ret;
}
catch (const std::exception& e) {
PrintExceptionContinue(&e, "AppInitUtil()");
return EXIT_FAILURE;
} catch (...) {
PrintExceptionContinue(nullptr, "AppInitUtil()");
return EXIT_FAILURE;
}
int ret = EXIT_FAILURE;
try {
ret = CommandLineUtil(argc, argv);
}
catch (const std::exception& e) {
PrintExceptionContinue(&e, "CommandLineUtil()");
} catch (...) {
PrintExceptionContinue(nullptr, "CommandLineUtil()");
}
return ret;
}
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