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// Copyright (c) 2009-2021 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 <chain.h>
#include <chainparams.h>
#include <chainparamsbase.h>
#include <clientversion.h>
#include <core_io.h>
#include <streams.h>
#include <util/system.h>
#include <util/translation.h>
#include <version.h>
#include <atomic>
#include <cstdio>
#include <functional>
#include <memory>
#include <thread>
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);
argsman.AddCommand("grind", "Perform proof of work on hex header string");
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(ArgsManager& args, int argc, char* argv[])
{
SetupBitcoinUtilArgs(args);
std::string error;
if (!args.ParseParameters(argc, argv, error)) {
tfm::format(std::cerr, "Error parsing command line arguments: %s\n", error);
return EXIT_FAILURE;
}
if (HelpRequested(args) || args.IsArgSet("-version")) {
// First part of help message is specific to this utility
std::string strUsage = PACKAGE_NAME " bitcoin-util utility version " + FormatFullVersion() + "\n";
if (args.IsArgSet("-version")) {
strUsage += FormatParagraph(LicenseInfo());
} else {
strUsage += "\n"
"Usage: bitcoin-util [options] [commands] Do stuff\n";
strUsage += "\n" + args.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;
}
// Check for chain settings (Params() calls are only valid after this clause)
try {
SelectParams(args.GetChainName());
} catch (const std::exception& e) {
tfm::format(std::cerr, "Error: %s\n", e.what());
return EXIT_FAILURE;
}
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(const std::vector<std::string>& args, std::string& strPrint)
{
if (args.size() != 1) {
strPrint = "Must specify block header to grind";
return EXIT_FAILURE;
}
CBlockHeader header;
if (!DecodeHexBlockHeader(header, args[0])) {
strPrint = "Could not decode block header";
return EXIT_FAILURE;
}
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 EXIT_FAILURE;
}
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
ss << header;
strPrint = HexStr(ss);
return EXIT_SUCCESS;
}
#ifdef WIN32
// Export main() and ensure working ASLR on Windows.
// Exporting a symbol will prevent the linker from stripping
// the .reloc section from the binary, which is a requirement
// for ASLR. This is a temporary workaround until a fixed
// version of binutils is used for releases.
__declspec(dllexport) int main(int argc, char* argv[])
#else
int main(int argc, char* argv[])
#endif
{
ArgsManager& args = gArgs;
SetupEnvironment();
try {
int ret = AppInitUtil(args, 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;
}
const auto cmd = args.GetCommand();
if (!cmd) {
tfm::format(std::cerr, "Error: must specify a command\n");
return EXIT_FAILURE;
}
int ret = EXIT_FAILURE;
std::string strPrint;
try {
if (cmd->command == "grind") {
ret = Grind(cmd->args, strPrint);
} else {
assert(false); // unknown command should be caught earlier
}
} catch (const std::exception& e) {
strPrint = std::string("error: ") + e.what();
} catch (...) {
strPrint = "unknown error";
}
if (strPrint != "") {
tfm::format(ret == 0 ? std::cout : std::cerr, "%s\n", strPrint);
}
return ret;
}
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