aboutsummaryrefslogtreecommitdiff
path: root/src/bitcoind.cpp
blob: 6851f86297654a66a796665217e54bd8162793bc (plain)
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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
// Copyright (c) 2009-2010 Satoshi Nakamoto
// 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 <chainparams.h>
#include <clientversion.h>
#include <common/url.h>
#include <compat/compat.h>
#include <init.h>
#include <interfaces/chain.h>
#include <interfaces/init.h>
#include <node/context.h>
#include <node/interface_ui.h>
#include <noui.h>
#include <shutdown.h>
#include <util/check.h>
#include <util/strencodings.h>
#include <util/syscall_sandbox.h>
#include <util/syserror.h>
#include <util/system.h>
#include <util/threadnames.h>
#include <util/tokenpipe.h>
#include <util/translation.h>

#include <any>
#include <functional>
#include <optional>

using node::NodeContext;

const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
UrlDecodeFn* const URL_DECODE = urlDecode;

#if HAVE_DECL_FORK

/** Custom implementation of daemon(). This implements the same order of operations as glibc.
 * Opens a pipe to the child process to be able to wait for an event to occur.
 *
 * @returns 0 if successful, and in child process.
 *          >0 if successful, and in parent process.
 *          -1 in case of error (in parent process).
 *
 *          In case of success, endpoint will be one end of a pipe from the child to parent process,
 *          which can be used with TokenWrite (in the child) or TokenRead (in the parent).
 */
int fork_daemon(bool nochdir, bool noclose, TokenPipeEnd& endpoint)
{
    // communication pipe with child process
    std::optional<TokenPipe> umbilical = TokenPipe::Make();
    if (!umbilical) {
        return -1; // pipe or pipe2 failed.
    }

    int pid = fork();
    if (pid < 0) {
        return -1; // fork failed.
    }
    if (pid != 0) {
        // Parent process gets read end, closes write end.
        endpoint = umbilical->TakeReadEnd();
        umbilical->TakeWriteEnd().Close();

        int status = endpoint.TokenRead();
        if (status != 0) { // Something went wrong while setting up child process.
            endpoint.Close();
            return -1;
        }

        return pid;
    }
    // Child process gets write end, closes read end.
    endpoint = umbilical->TakeWriteEnd();
    umbilical->TakeReadEnd().Close();

#if HAVE_DECL_SETSID
    if (setsid() < 0) {
        exit(1); // setsid failed.
    }
#endif

    if (!nochdir) {
        if (chdir("/") != 0) {
            exit(1); // chdir failed.
        }
    }
    if (!noclose) {
        // Open /dev/null, and clone it into STDIN, STDOUT and STDERR to detach
        // from terminal.
        int fd = open("/dev/null", O_RDWR);
        if (fd >= 0) {
            bool err = dup2(fd, STDIN_FILENO) < 0 || dup2(fd, STDOUT_FILENO) < 0 || dup2(fd, STDERR_FILENO) < 0;
            // Don't close if fd<=2 to try to handle the case where the program was invoked without any file descriptors open.
            if (fd > 2) close(fd);
            if (err) {
                exit(1); // dup2 failed.
            }
        } else {
            exit(1); // open /dev/null failed.
        }
    }
    endpoint.TokenWrite(0); // Success
    return 0;
}

#endif

static bool AppInit(NodeContext& node, int argc, char* argv[])
{
    bool fRet = false;

    util::ThreadSetInternalName("init");

    // If Qt is used, parameters/bitcoin.conf are parsed in qt/bitcoin.cpp's main()
    ArgsManager& args = *Assert(node.args);
    SetupServerArgs(args);
    std::string error;
    if (!args.ParseParameters(argc, argv, error)) {
        return InitError(Untranslated(strprintf("Error parsing command line arguments: %s\n", error)));
    }

    // Process help and version before taking care about datadir
    if (HelpRequested(args) || args.IsArgSet("-version")) {
        std::string strUsage = PACKAGE_NAME " version " + FormatFullVersion() + "\n";

        if (args.IsArgSet("-version")) {
            strUsage += FormatParagraph(LicenseInfo());
        } else {
            strUsage += "\nUsage:  bitcoind [options]                     Start " PACKAGE_NAME "\n"
                "\n";
            strUsage += args.GetHelpMessage();
        }

        tfm::format(std::cout, "%s", strUsage);
        return true;
    }

#if HAVE_DECL_FORK
    // Communication with parent after daemonizing. This is used for signalling in the following ways:
    // - a boolean token is sent when the initialization process (all the Init* functions) have finished to indicate
    // that the parent process can quit, and whether it was successful/unsuccessful.
    // - an unexpected shutdown of the child process creates an unexpected end of stream at the parent
    // end, which is interpreted as failure to start.
    TokenPipeEnd daemon_ep;
#endif
    std::any context{&node};
    try
    {
        if (!CheckDataDirOption(args)) {
            return InitError(Untranslated(strprintf("Specified data directory \"%s\" does not exist.\n", args.GetArg("-datadir", ""))));
        }
        if (!args.ReadConfigFiles(error, true)) {
            return InitError(Untranslated(strprintf("Error reading configuration file: %s\n", error)));
        }
        // Check for chain settings (Params() calls are only valid after this clause)
        try {
            SelectParams(args.GetChainName());
        } catch (const std::exception& e) {
            return InitError(Untranslated(strprintf("%s\n", e.what())));
        }

        // Error out when loose non-argument tokens are encountered on command line
        for (int i = 1; i < argc; i++) {
            if (!IsSwitchChar(argv[i][0])) {
                return InitError(Untranslated(strprintf("Command line contains unexpected token '%s', see bitcoind -h for a list of options.\n", argv[i])));
            }
        }

        if (!args.InitSettings(error)) {
            InitError(Untranslated(error));
            return false;
        }

        // -server defaults to true for bitcoind but not for the GUI so do this here
        args.SoftSetBoolArg("-server", true);
        // Set this early so that parameter interactions go to console
        InitLogging(args);
        InitParameterInteraction(args);
        if (!AppInitBasicSetup(args)) {
            // InitError will have been called with detailed error, which ends up on console
            return false;
        }
        if (!AppInitParameterInteraction(args)) {
            // InitError will have been called with detailed error, which ends up on console
            return false;
        }

        node.kernel = std::make_unique<kernel::Context>();
        if (!AppInitSanityChecks(*node.kernel))
        {
            // InitError will have been called with detailed error, which ends up on console
            return false;
        }

        if (args.GetBoolArg("-daemon", DEFAULT_DAEMON) || args.GetBoolArg("-daemonwait", DEFAULT_DAEMONWAIT)) {
#if HAVE_DECL_FORK
            tfm::format(std::cout, PACKAGE_NAME " starting\n");

            // Daemonize
            switch (fork_daemon(1, 0, daemon_ep)) { // don't chdir (1), do close FDs (0)
            case 0: // Child: continue.
                // If -daemonwait is not enabled, immediately send a success token the parent.
                if (!args.GetBoolArg("-daemonwait", DEFAULT_DAEMONWAIT)) {
                    daemon_ep.TokenWrite(1);
                    daemon_ep.Close();
                }
                break;
            case -1: // Error happened.
                return InitError(Untranslated(strprintf("fork_daemon() failed: %s\n", SysErrorString(errno))));
            default: { // Parent: wait and exit.
                int token = daemon_ep.TokenRead();
                if (token) { // Success
                    exit(EXIT_SUCCESS);
                } else { // fRet = false or token read error (premature exit).
                    tfm::format(std::cerr, "Error during initialization - check debug.log for details\n");
                    exit(EXIT_FAILURE);
                }
            }
            }
#else
            return InitError(Untranslated("-daemon is not supported on this operating system\n"));
#endif // HAVE_DECL_FORK
        }
        // Lock data directory after daemonization
        if (!AppInitLockDataDirectory())
        {
            // If locking the data directory failed, exit immediately
            return false;
        }
        fRet = AppInitInterfaces(node) && AppInitMain(node);
    }
    catch (const std::exception& e) {
        PrintExceptionContinue(&e, "AppInit()");
    } catch (...) {
        PrintExceptionContinue(nullptr, "AppInit()");
    }

#if HAVE_DECL_FORK
    if (daemon_ep.IsOpen()) {
        // Signal initialization status to parent, then close pipe.
        daemon_ep.TokenWrite(fRet);
        daemon_ep.Close();
    }
#endif
    SetSyscallSandboxPolicy(SyscallSandboxPolicy::SHUTOFF);
    if (fRet) {
        WaitForShutdown();
    }
    Interrupt(node);
    Shutdown(node);

    return fRet;
}

MAIN_FUNCTION
{
#ifdef WIN32
    util::WinCmdLineArgs winArgs;
    std::tie(argc, argv) = winArgs.get();
#endif

    NodeContext node;
    int exit_status;
    std::unique_ptr<interfaces::Init> init = interfaces::MakeNodeInit(node, argc, argv, exit_status);
    if (!init) {
        return exit_status;
    }

    SetupEnvironment();

    // Connect bitcoind signal handlers
    noui_connect();

    return (AppInit(node, argc, argv) ? EXIT_SUCCESS : EXIT_FAILURE);
}