1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
// Copyright (c) 2009-2022 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 <compat/compat.h>
#include <core_io.h>
#include <streams.h>
#include <util/exception.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, uint32_t offset, uint32_t step, std::atomic<bool>& found, uint32_t& proposed_nonce)
{
arith_uint256 target;
bool neg, over;
target.SetCompact(nBits, &neg, &over);
if (target == 0 || neg || over) return;
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)) {
proposed_nonce = 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};
uint32_t proposed_nonce{};
std::vector<std::thread> threads;
int n_tasks = std::max(1u, std::thread::hardware_concurrency());
threads.reserve(n_tasks);
for (int i = 0; i < n_tasks; ++i) {
threads.emplace_back(grind_task, nBits, header, i, n_tasks, std::ref(found), std::ref(proposed_nonce));
}
for (auto& t : threads) {
t.join();
}
if (found) {
header.nNonce = proposed_nonce;
} else {
strPrint = "Could not satisfy difficulty target";
return EXIT_FAILURE;
}
DataStream ss{};
ss << header;
strPrint = HexStr(ss);
return EXIT_SUCCESS;
}
MAIN_FUNCTION
{
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;
}
|
