// Copyright (c) 2009-2010 Satoshi Nakamoto

// Copyright (c) 2009-2017 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 <init.h>

#include <addrman.h>

#include <amount.h>

#include <chain.h>

#include <chainparams.h>

#include <checkpoints.h>

#include <compat/sanity.h>

#include <consensus/validation.h>

#include <fs.h>

#include <httpserver.h>

#include <httprpc.h>

#include <key.h>

#include <validation.h>

#include <miner.h>

#include <netbase.h>

#include <net.h>

#include <net_processing.h>

#include <policy/feerate.h>

#include <policy/fees.h>

#include <policy/policy.h>

#include <rpc/server.h>

#include <rpc/register.h>

#include <rpc/safemode.h>

#include <rpc/blockchain.h>

#include <script/standard.h>

#include <script/sigcache.h>

#include <scheduler.h>

#include <timedata.h>

#include <txdb.h>

#include <txmempool.h>

#include <torcontrol.h>

#include <ui_interface.h>

#include <util.h>

#include <utilmoneystr.h>

#include <validationinterface.h>

#ifdef ENABLE_WALLET

#include <wallet/init.h>

#endif

#include <warnings.h>

#include <stdint.h>

#include <stdio.h>

#include <memory>

#ifndef WIN32

#include <signal.h>

#endif

#include <boost/algorithm/string/classification.hpp>

#include <boost/algorithm/string/replace.hpp>

#include <boost/algorithm/string/split.hpp>

#include <boost/bind.hpp>

#include <boost/interprocess/sync/file_lock.hpp>

#include <boost/thread.hpp>

#include <openssl/crypto.h>

#if ENABLE_ZMQ

#include <zmq/zmqnotificationinterface.h>

#endif

bool fFeeEstimatesInitialized = false;

static const bool DEFAULT_PROXYRANDOMIZE = true;

static const bool DEFAULT_REST_ENABLE = false;

static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;

std::unique_ptr<CConnman> g_connman;

std::unique_ptr<PeerLogicValidation> peerLogic;

#if ENABLE_ZMQ

static CZMQNotificationInterface* pzmqNotificationInterface = nullptr;

#endif

#ifdef WIN32

// Win32 LevelDB doesn't use filedescriptors, and the ones used for

// accessing block files don't count towards the fd_set size limit

// anyway.

#define MIN_CORE_FILEDESCRIPTORS 0

#else

#define MIN_CORE_FILEDESCRIPTORS 150

#endif

static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";

//////////////////////////////////////////////////////////////////////////////

//

// Shutdown

//

//

// Thread management and startup/shutdown:

//

// The network-processing threads are all part of a thread group

// created by AppInit() or the Qt main() function.

//

// A clean exit happens when StartShutdown() or the SIGTERM

// signal handler sets fRequestShutdown, which makes main thread's

// WaitForShutdown() interrupts the thread group.

// And then, WaitForShutdown() makes all other on-going threads

// in the thread group join the main thread.

// Shutdown() is then called to clean up database connections, and stop other

// threads that should only be stopped after the main network-processing

// threads have exited.

//

// Shutdown for Qt is very similar, only it uses a QTimer to detect

// fRequestShutdown getting set, and then does the normal Qt

// shutdown thing.

//

std::atomic<bool> fRequestShutdown(false);

std::atomic<bool> fDumpMempoolLater(false);

void StartShutdown()

{

fRequestShutdown = true;

}

bool ShutdownRequested()

{

return fRequestShutdown;

}

/**

* This is a minimally invasive approach to shutdown on LevelDB read errors from the

* chainstate, while keeping user interface out of the common library, which is shared

* between bitcoind, and bitcoin-qt and non-server tools.

*/

class CCoinsViewErrorCatcher final : public CCoinsViewBacked

{

public:

explicit CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}

bool GetCoin(const COutPoint &outpoint, Coin &coin) const override {

try {

return CCoinsViewBacked::GetCoin(outpoint, coin);

} catch(const std::runtime_error& e) {

uiInterface.ThreadSafeMessageBox(_("Error reading from database, shutting down."), "", CClientUIInterface::MSG_ERROR);

LogPrintf("Error reading from database: %s\n", e.what());

// Starting the shutdown sequence and returning false to the caller would be

// interpreted as 'entry not found' (as opposed to unable to read data), and

// could lead to invalid interpretation. Just exit immediately, as we can't

// continue anyway, and all writes should be atomic.

abort();

}

}

// Writes do not need similar protection, as failure to write is handled by the caller.

};

static std::unique_ptr<CCoinsViewErrorCatcher> pcoinscatcher;

static std::unique_ptr<ECCVerifyHandle> globalVerifyHandle;

static boost::thread_group threadGroup;

static CScheduler scheduler;

void Interrupt()

{

InterruptHTTPServer();

InterruptHTTPRPC();

InterruptRPC();

InterruptREST();

InterruptTorControl();

if (g_connman)

g_connman->Interrupt();

}

void Shutdown()

{

LogPrintf("%s: In progress...\n", __func__);

static CCriticalSection cs_Shutdown;

TRY_LOCK(cs_Shutdown, lockShutdown);

if (!lockShutdown)

return;

/// Note: Shutdown() must be able to handle cases in which initialization failed part of the way,

/// for example if the data directory was found to be locked.

/// Be sure that anything that writes files or flushes caches only does this if the respective

/// module was initialized.

RenameThread("bitcoin-shutoff");

mempool.AddTransactionsUpdated(1);

StopHTTPRPC();

StopREST();

StopRPC();

StopHTTPServer();

#ifdef ENABLE_WALLET

FlushWallets();

#endif

MapPort(false);

// Because these depend on each-other, we make sure that neither can be

// using the other before destroying them.

if (peerLogic) UnregisterValidationInterface(peerLogic.get());

if (g_connman) g_connman->Stop();

peerLogic.reset();

g_connman.reset();

StopTorControl();

// After everything has been shut down, but before things get flushed, stop the

// CScheduler/checkqueue threadGroup

threadGroup.interrupt_all();

threadGroup.join_all();

if (fDumpMempoolLater && gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {

DumpMempool();

}

if (fFeeEstimatesInitialized)

{

::feeEstimator.FlushUnconfirmed(::mempool);

fs::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;

CAutoFile est_fileout(fsbridge::fopen(est_path, "wb"), SER_DISK, CLIENT_VERSION);

if (!est_fileout.IsNull())

::feeEstimator.Write(est_fileout);

else

LogPrintf("%s: Failed to write fee estimates to %s\n", __func__, est_path.string());

fFeeEstimatesInitialized = false;

}

// FlushStateToDisk generates a SetBestChain callback, which we should avoid missing

if (pcoinsTip != nullptr) {

FlushStateToDisk();

}

// After there are no more peers/RPC left to give us new data which may generate

// CValidationInterface callbacks, flush them...

GetMainSignals().FlushBackgroundCallbacks();

// Any future callbacks will be dropped. This should absolutely be safe - if

// missing a callback results in an unrecoverable situation, unclean shutdown

// would too. The only reason to do the above flushes is to let the wallet catch

// up with our current chain to avoid any strange pruning edge cases and make

// next startup faster by avoiding rescan.

{

LOCK(cs_main);

if (pcoinsTip != nullptr) {

FlushStateToDisk();

}

pcoinsTip.reset();

pcoinscatcher.reset();

pcoinsdbview.reset();

pblocktree.reset();

}

#ifdef ENABLE_WALLET

StopWallets();

#endif

#if ENABLE_ZMQ

if (pzmqNotificationInterface) {

UnregisterValidationInterface(pzmqNotificationInterface);

delete pzmqNotificationInterface;

pzmqNotificationInterface = nullptr;

}

#endif

#ifndef WIN32

try {

fs::remove(GetPidFile());

} catch (const fs::filesystem_error& e) {

LogPrintf("%s: Unable to remove pidfile: %s\n", __func__, e.what());

}

#endif

UnregisterAllValidationInterfaces();

GetMainSignals().UnregisterBackgroundSignalScheduler();

GetMainSignals().UnregisterWithMempoolSignals(mempool);

#ifdef ENABLE_WALLET

CloseWallets();

#endif

globalVerifyHandle.reset();

ECC_Stop();

LogPrintf("%s: done\n", __func__);

}

/**

* Signal handlers are very limited in what they are allowed to do.

* The execution context the handler is invoked in is not guaranteed,

* so we restrict handler operations to just touching variables:

*/

#ifndef WIN32

static void HandleSIGTERM(int)

{

fRequestShutdown = true;

}

static void HandleSIGHUP(int)

{

fReopenDebugLog = true;

}

#else

static BOOL WINAPI consoleCtrlHandler(DWORD dwCtrlType)

{

fRequestShutdown = true;

Sleep(INFINITE);

return true;

}

#endif

#ifndef WIN32

static void registerSignalHandler(int signal, void(*handler)(int))

{

struct sigaction sa;

sa.sa_handler = handler;

sigemptyset(&sa.sa_mask);

sa.sa_flags = 0;

sigaction(signal, &sa, nullptr);

}

#endif

void OnRPCStarted()

{

uiInterface.NotifyBlockTip.connect(&RPCNotifyBlockChange);

}

void OnRPCStopped()

{

uiInterface.NotifyBlockTip.disconnect(&RPCNotifyBlockChange);

RPCNotifyBlockChange(false, nullptr);

cvBlockChange.notify_all();

LogPrint(BCLog::RPC, "RPC stopped.\n");

}

std::string HelpMessage(HelpMessageMode mode)

{

const auto defaultBaseParams = CreateBaseChainParams(CBaseChainParams::MAIN);

const auto testnetBaseParams = CreateBaseChainParams(CBaseChainParams::TESTNET);

const auto defaultChainParams = CreateChainParams(CBaseChainParams::MAIN);

const auto testnetChainParams = CreateChainParams(CBaseChainParams::TESTNET);

const bool showDebug = gArgs.GetBoolArg("-help-debug", false);

// When adding new options to the categories, please keep and ensure alphabetical ordering.

// Do not translate _(...) -help-debug options, Many technical terms, and only a very small audience, so is unnecessary stress to translators.

std::string strUsage = HelpMessageGroup(_("Options:"));

strUsage += HelpMessageOpt("-?", _("Print this help message and exit"));

strUsage += HelpMessageOpt("-version", _("Print version and exit"));

strUsage += HelpMessageOpt("-alertnotify=<cmd>", _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)"));

strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash)"));

if (showDebug)

strUsage += HelpMessageOpt("-blocksonly", strprintf(_("Whether to operate in a blocks only mode (default: %u)"), DEFAULT_BLOCKSONLY));

strUsage +=HelpMessageOpt("-assumevalid=<hex>", strprintf(_("If this block is in the chain assume that it and its ancestors are valid and potentially skip their script verification (0 to verify all, default: %s, testnet: %s)"), defaultChainParams->GetConsensus().defaultAssumeValid.GetHex(), testnetChainParams->GetConsensus().defaultAssumeValid.GetHex()));

strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), BITCOIN_CONF_FILENAME));

if (mode == HMM_BITCOIND)

{

#if HAVE_DECL_DAEMON

strUsage += HelpMessageOpt("-daemon", _("Run in the background as a daemon and accept commands"));

#endif

}

strUsage += HelpMessageOpt("-datadir=<dir>", _("Specify data directory"));

if (showDebug) {

strUsage += HelpMessageOpt("-dbbatchsize", strprintf("Maximum database write batch size in bytes (default: %u)", nDefaultDbBatchSize));

}

strUsage += HelpMessageOpt("-dbcache=<n>", strprintf(_("Set database cache size in megabytes (%d to %d, default: %d)"), nMinDbCache, nMaxDbCache, nDefaultDbCache));

if (showDebug)

strUsage += HelpMessageOpt("-feefilter", strprintf("Tell other nodes to filter invs to us by our mempool min fee (default: %u)", DEFAULT_FEEFILTER));

strUsage += HelpMessageOpt("-loadblock=<file>", _("Imports blocks from external blk000??.dat file on startup"));

strUsage += HelpMessageOpt("-debuglogfile=<file>", strprintf(_("Specify location of debug log file: this can be an absolute path or a path relative to the data directory (default: %s)"), DEFAULT_DEBUGLOGFILE));

strUsage += HelpMessageOpt("-maxorphantx=<n>", strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS));

strUsage += HelpMessageOpt("-maxmempool=<n>", strprintf(_("Keep the transaction memory pool below <n> megabytes (default: %u)"), DEFAULT_MAX_MEMPOOL_SIZE));

strUsage += HelpMessageOpt("-mempoolexpiry=<n>", strprintf(_("Do not keep transactions in the mempool longer than <n> hours (default: %u)"), DEFAULT_MEMPOOL_EXPIRY));

if (showDebug) {

strUsage += HelpMessageOpt("-minimumchainwork=<hex>", strprintf("Minimum work assumed to exist on a valid chain in hex (default: %s, testnet: %s)", defaultChainParams->GetConsensus().nMinimumChainWork.GetHex(), testnetChainParams->GetConsensus().nMinimumChainWork.GetHex()));

}

strUsage += HelpMessageOpt("-persistmempool", strprintf(_("Whether to save the mempool on shutdown and load on restart (default: %u)"), DEFAULT_PERSIST_MEMPOOL));

strUsage += HelpMessageOpt("-blockreconstructionextratxn=<n>", strprintf(_("Extra transactions to keep in memory for compact block reconstructions (default: %u)"), DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN));

strUsage += HelpMessageOpt("-par=<n>", strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"),

-GetNumCores(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS));

#ifndef WIN32

strUsage += HelpMessageOpt("-pid=<file>", strprintf(_("Specify pid file (default: %s)"), BITCOIN_PID_FILENAME));

#endif

strUsage += HelpMessageOpt("-prune=<n>", strprintf(_("Reduce storage requirements by enabling pruning (deleting) of old blocks. This allows the pruneblockchain RPC to be called to delete specific blocks, and enables automatic pruning of old blocks if a target size in MiB is provided. This mode is incompatible with -txindex and -rescan. "

"Warning: Reverting this setting requires re-downloading the entire blockchain. "

"(default: 0 = disable pruning blocks, 1 = allow manual pruning via RPC, >=%u = automatically prune block files to stay under the specified target size in MiB)"), MIN_DISK_SPACE_FOR_BLOCK_FILES / 1024 / 1024));

strUsage += HelpMessageOpt("-reindex-chainstate", _("Rebuild chain state from the currently indexed blocks"));

strUsage += HelpMessageOpt("-reindex", _("Rebuild chain state and block index from the blk*.dat files on disk"));

#ifndef WIN32

strUsage += HelpMessageOpt("-sysperms", _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)"));

#endif

strUsage += HelpMessageOpt("-txindex", strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), DEFAULT_TXINDEX));

strUsage += HelpMessageGroup(_("Connection options:"));

strUsage += HelpMessageOpt("-addnode=<ip>", _("Add a node to connect to and attempt to keep the connection open (see the `addnode` RPC command help for more info)"));

strUsage += HelpMessageOpt("-banscore=<n>", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD));

strUsage += HelpMessageOpt("-bantime=<n>", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME));

strUsage += HelpMessageOpt("-bind=<addr>", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6"));

strUsage += HelpMessageOpt("-connect=<ip>", _("Connect only to the specified node(s); -connect=0 disables automatic connections (the rules for this peer are the same as for -addnode)"));

strUsage += HelpMessageOpt("-discover", _("Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)"));

strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + strprintf(_("(default: %u)"), DEFAULT_NAME_LOOKUP));

strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect used)"));

strUsage += HelpMessageOpt("-externalip=<ip>", _("Specify your own public address"));

strUsage += HelpMessageOpt("-forcednsseed", strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), DEFAULT_FORCEDNSSEED));

strUsage += HelpMessageOpt("-listen", _("Accept connections from outside (default: 1 if no -proxy or -connect)"));

strUsage += HelpMessageOpt("-listenonion", strprintf(_("Automatically create Tor hidden service (default: %d)"), DEFAULT_LISTEN_ONION));

strUsage += HelpMessageOpt("-maxconnections=<n>", strprintf(_("Maintain at most <n> connections to peers (default: %u)"), DEFAULT_MAX_PEER_CONNECTIONS));

strUsage += HelpMessageOpt("-maxreceivebuffer=<n>", strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXRECEIVEBUFFER));

strUsage += HelpMessageOpt("-maxsendbuffer=<n>", strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), DEFAULT_MAXSENDBUFFER));

strUsage += HelpMessageOpt("-maxtimeadjustment", strprintf(_("Maximum allowed median peer time offset adjustment. Local perspective of time may be influenced by peers forward or backward by this amount. (default: %u seconds)"), DEFAULT_MAX_TIME_ADJUSTMENT));

strUsage += HelpMessageOpt("-onion=<ip:port>", strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: %s)"), "-proxy"));

strUsage += HelpMessageOpt("-onlynet=<net>", _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)"));

strUsage += HelpMessageOpt("-permitbaremultisig", strprintf(_("Relay non-P2SH multisig (default: %u)"), DEFAULT_PERMIT_BAREMULTISIG));

strUsage += HelpMessageOpt("-peerbloomfilters", strprintf(_("Support filtering of blocks and transaction with bloom filters (default: %u)"), DEFAULT_PEERBLOOMFILTERS));

strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), defaultChainParams->GetDefaultPort(), testnetChainParams->GetDefaultPort()));

strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));

strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), DEFAULT_PROXYRANDOMIZE));

strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));

strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));

strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));

strUsage += HelpMessageOpt("-torpassword=<pass>", _("Tor control port password (default: empty)"));

#ifdef USE_UPNP

#if USE_UPNP

strUsage += HelpMessageOpt("-upnp", _("Use UPnP to map the listening port (default: 1 when listening and no -proxy)"));

#else

strUsage += HelpMessageOpt("-upnp", strprintf(_("Use UPnP to map the listening port (default: %u)"), 0));

#endif

#endif

strUsage += HelpMessageOpt("-whitebind=<addr>", _("Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6"));

strUsage += HelpMessageOpt("-whitelist=<IP address or network>", _("Whitelist peers connecting from the given IP address (e.g. 1.2.3.4) or CIDR notated network (e.g. 1.2.3.0/24). Can be specified multiple times.") +

" " + _("Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway"));

strUsage += HelpMessageOpt("-maxuploadtarget=<n>", strprintf(_("Tries to keep outbound traffic under the given target (in MiB per 24h), 0 = no limit (default: %d)"), DEFAULT_MAX_UPLOAD_TARGET));

#ifdef ENABLE_WALLET

strUsage += GetWalletHelpString(showDebug);

#endif

#if ENABLE_ZMQ

strUsage += HelpMessageGroup(_("ZeroMQ notification options:"));

strUsage += HelpMessageOpt("-zmqpubhashblock=<address>", _("Enable publish hash block in <address>"));

strUsage += HelpMessageOpt("-zmqpubhashtx=<address>", _("Enable publish hash transaction in <address>"));

strUsage += HelpMessageOpt("-zmqpubrawblock=<address>", _("Enable publish raw block in <address>"));

strUsage += HelpMessageOpt("-zmqpubrawtx=<address>", _("Enable publish raw transaction in <address>"));

#endif

strUsage += HelpMessageGroup(_("Debugging/Testing options:"));

strUsage += HelpMessageOpt("-uacomment=<cmt>", _("Append comment to the user agent string"));

if (showDebug)

{

strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), DEFAULT_CHECKBLOCKS));

strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), DEFAULT_CHECKLEVEL));

strUsage += HelpMessageOpt("-checkblockindex", strprintf("Do a full consistency check for mapBlockIndex, setBlockIndexCandidates, chainActive and mapBlocksUnlinked occasionally. Also sets -checkmempool (default: %u)", defaultChainParams->DefaultConsistencyChecks()));

strUsage += HelpMessageOpt("-checkmempool=<n>", strprintf("Run checks every <n> transactions (default: %u)", defaultChainParams->DefaultConsistencyChecks()));

strUsage += HelpMessageOpt("-checkpoints", strprintf("Disable expensive verification for known chain history (default: %u)", DEFAULT_CHECKPOINTS_ENABLED));

strUsage += HelpMessageOpt("-disablesafemode", strprintf("Disable safemode, override a real safe mode event (default: %u)", DEFAULT_DISABLE_SAFEMODE));

strUsage += HelpMessageOpt("-deprecatedrpc=<method>", "Allows deprecated RPC method(s) to be used");

strUsage += HelpMessageOpt("-testsafemode", strprintf("Force safe mode (default: %u)", DEFAULT_TESTSAFEMODE));

strUsage += HelpMessageOpt("-dropmessagestest=<n>", "Randomly drop 1 of every <n> network messages");

strUsage += HelpMessageOpt("-fuzzmessagestest=<n>", "Randomly fuzz 1 of every <n> network messages");

strUsage += HelpMessageOpt("-stopafterblockimport", strprintf("Stop running after importing blocks from disk (default: %u)", DEFAULT_STOPAFTERBLOCKIMPORT));

strUsage += HelpMessageOpt("-stopatheight", strprintf("Stop running after reaching the given height in the main chain (default: %u)", DEFAULT_STOPATHEIGHT));

strUsage += HelpMessageOpt("-limitancestorcount=<n>", strprintf("Do not accept transactions if number of in-mempool ancestors is <n> or more (default: %u)", DEFAULT_ANCESTOR_LIMIT));

strUsage += HelpMessageOpt("-limitancestorsize=<n>", strprintf("Do not accept transactions whose size with all in-mempool ancestors exceeds <n> kilobytes (default: %u)", DEFAULT_ANCESTOR_SIZE_LIMIT));

strUsage += HelpMessageOpt("-limitdescendantcount=<n>", strprintf("Do not accept transactions if any ancestor would have <n> or more in-mempool descendants (default: %u)", DEFAULT_DESCENDANT_LIMIT));

strUsage += HelpMessageOpt("-limitdescendantsize=<n>", strprintf("Do not accept transactions if any ancestor would have more than <n> kilobytes of in-mempool descendants (default: %u).", DEFAULT_DESCENDANT_SIZE_LIMIT));

strUsage += HelpMessageOpt("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest-only)");

}

strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +

_("If <category> is not supplied or if <category> = 1, output all debugging information.") + " " + _("<category> can be:") + " " + ListLogCategories() + ".");

strUsage += HelpMessageOpt("-debugexclude=<category>", strprintf(_("Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except one or more specified categories.")));

strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));

strUsage += HelpMessageOpt("-logips", strprintf(_("Include IP addresses in debug output (default: %u)"), DEFAULT_LOGIPS));

strUsage += HelpMessageOpt("-logtimestamps", strprintf(_("Prepend debug output with timestamp (default: %u)"), DEFAULT_LOGTIMESTAMPS));

if (showDebug)

{

strUsage += HelpMessageOpt("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS));

strUsage += HelpMessageOpt("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)");

strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf("Limit sum of signature cache and script execution cache sizes to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE));

strUsage += HelpMessageOpt("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE));

}

strUsage += HelpMessageOpt("-maxtxfee=<amt>", strprintf(_("Maximum total fees (in %s) to use in a single wallet transaction or raw transaction; setting this too low may abort large transactions (default: %s)"),

CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)));

strUsage += HelpMessageOpt("-printtoconsole", _("Send trace/debug info to console instead of debug.log file"));

if (showDebug)

{

strUsage += HelpMessageOpt("-printpriority", strprintf("Log transaction fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY));

}

strUsage += HelpMessageOpt("-shrinkdebugfile", _("Shrink debug.log file on client startup (default: 1 when no -debug)"));

AppendParamsHelpMessages(strUsage, showDebug);

strUsage += HelpMessageGroup(_("Node relay options:"));

if (showDebug) {

strUsage += HelpMessageOpt("-acceptnonstdtxn", strprintf("Relay and mine \"non-standard\" transactions (%sdefault: %u)", "testnet/regtest only; ", !testnetChainParams->RequireStandard()));

strUsage += HelpMessageOpt("-incrementalrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to define cost of relay, used for mempool limiting and BIP 125 replacement. (default: %s)", CURRENCY_UNIT, FormatMoney(DEFAULT_INCREMENTAL_RELAY_FEE)));

strUsage += HelpMessageOpt("-dustrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to defined dust, the value of an output such that it will cost more than its value in fees at this fee rate to spend it. (default: %s)", CURRENCY_UNIT, FormatMoney(DUST_RELAY_TX_FEE)));

}

strUsage += HelpMessageOpt("-bytespersigop", strprintf(_("Equivalent bytes per sigop in transactions for relay and mining (default: %u)"), DEFAULT_BYTES_PER_SIGOP));

strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));

strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));

strUsage += HelpMessageOpt("-mempoolreplacement", strprintf(_("Enable transaction replacement in the memory pool (default: %u)"), DEFAULT_ENABLE_REPLACEMENT));

strUsage += HelpMessageOpt("-minrelaytxfee=<amt>", strprintf(_("Fees (in %s/kB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: %s)"),

CURRENCY_UNIT, FormatMoney(DEFAULT_MIN_RELAY_TX_FEE)));

strUsage += HelpMessageOpt("-whitelistrelay", strprintf(_("Accept relayed transactions received from whitelisted peers even when not relaying transactions (default: %d)"), DEFAULT_WHITELISTRELAY));

strUsage += HelpMessageOpt("-whitelistforcerelay", strprintf(_("Force relay of transactions from whitelisted peers even if they violate local relay policy (default: %d)"), DEFAULT_WHITELISTFORCERELAY));

strUsage += HelpMessageGroup(_("Block creation options:"));

strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));

strUsage += HelpMessageOpt("-blockmintxfee=<amt>", strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be included in block creation. (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE)));

if (showDebug)

strUsage += HelpMessageOpt("-blockversion=<n>", "Override block version to test forking scenarios");

strUsage += HelpMessageGroup(_("RPC server options:"));

strUsage += HelpMessageOpt("-server", _("Accept command line and JSON-RPC commands"));

strUsage += HelpMessageOpt("-rest", strprintf(_("Accept public REST requests (default: %u)"), DEFAULT_REST_ENABLE));

strUsage += HelpMessageOpt("-rpcbind=<addr>[:port]", _("Bind to given address to listen for JSON-RPC connections. This option is ignored unless -rpcallowip is also passed. Port is optional and overrides -rpcport. Use [host]:port notation for IPv6. This option can be specified multiple times (default: 127.0.0.1 and ::1 i.e., localhost, or if -rpcallowip has been specified, 0.0.0.0 and :: i.e., all addresses)"));

strUsage += HelpMessageOpt("-rpccookiefile=<loc>", _("Location of the auth cookie (default: data dir)"));

strUsage += HelpMessageOpt("-rpcuser=<user>", _("Username for JSON-RPC connections"));

strUsage += HelpMessageOpt("-rpcpassword=<pw>", _("Password for JSON-RPC connections"));

strUsage += HelpMessageOpt("-rpcauth=<userpw>", _("Username and hashed password for JSON-RPC connections. The field <userpw> comes in the format: <USERNAME>:<SALT>$<HASH>. A canonical python script is included in share/rpcuser. The client then connects normally using the rpcuser=<USERNAME>/rpcpassword=<PASSWORD> pair of arguments. This option can be specified multiple times"));

strUsage += HelpMessageOpt("-rpcport=<port>", strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), defaultBaseParams->RPCPort(), testnetBaseParams->RPCPort()));

strUsage += HelpMessageOpt("-rpcallowip=<ip>", _("Allow JSON-RPC connections from specified source. Valid for <ip> are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24). This option can be specified multiple times"));

strUsage += HelpMessageOpt("-rpcserialversion", strprintf(_("Sets the serialization of raw transaction or block hex returned in non-verbose mode, non-segwit(0) or segwit(1) (default: %d)"), DEFAULT_RPC_SERIALIZE_VERSION));

strUsage += HelpMessageOpt("-rpcthreads=<n>", strprintf(_("Set the number of threads to service RPC calls (default: %d)"), DEFAULT_HTTP_THREADS));

if (showDebug) {

strUsage += HelpMessageOpt("-rpcworkqueue=<n>", strprintf("Set the depth of the work queue to service RPC calls (default: %d)", DEFAULT_HTTP_WORKQUEUE));

strUsage += HelpMessageOpt("-rpcservertimeout=<n>", strprintf("Timeout during HTTP requests (default: %d)", DEFAULT_HTTP_SERVER_TIMEOUT));

}

return strUsage;

}

std::string LicenseInfo()

{

const std::string URL_SOURCE_CODE = "<https://github.com/bitcoin/bitcoin>";

const std::string URL_WEBSITE = "<https://bitcoincore.org>";

return CopyrightHolders(strprintf(_("Copyright (C) %i-%i"), 2009, COPYRIGHT_YEAR) + " ") + "\n" +

"\n" +

strprintf(_("Please contribute if you find %s useful. "

"Visit %s for further information about the software."),

PACKAGE_NAME, URL_WEBSITE) +

"\n" +

strprintf(_("The source code is available from %s."),

URL_SOURCE_CODE) +

"\n" +

"\n" +

_("This is experimental software.") + "\n" +

strprintf(_("Distributed under the MIT software license, see the accompanying file %s or %s"), "COPYING", "<https://opensource.org/licenses/MIT>") + "\n" +

"\n" +

strprintf(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit %s and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard."), "<https://www.openssl.org>") +

"\n";

}

static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex)

{

if (initialSync || !pBlockIndex)

return;

std::string strCmd = gArgs.GetArg("-blocknotify", "");

if (!strCmd.empty()) {

boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());

boost::thread t(runCommand, strCmd); // thread runs free

}

}

static bool fHaveGenesis = false;

static CWaitableCriticalSection cs_GenesisWait;

static CConditionVariable condvar_GenesisWait;

static void BlockNotifyGenesisWait(bool, const CBlockIndex *pBlockIndex)

{

if (pBlockIndex != nullptr) {

{

WaitableLock lock_GenesisWait(cs_GenesisWait);

fHaveGenesis = true;

}

condvar_GenesisWait.notify_all();

}

}

struct CImportingNow

{

CImportingNow() {

assert(fImporting == false);

fImporting = true;

}

~CImportingNow() {

assert(fImporting == true);

fImporting = false;

}

};

// If we're using -prune with -reindex, then delete block files that will be ignored by the

// reindex. Since reindexing works by starting at block file 0 and looping until a blockfile

// is missing, do the same here to delete any later block files after a gap. Also delete all

// rev files since they'll be rewritten by the reindex anyway. This ensures that vinfoBlockFile

// is in sync with what's actually on disk by the time we start downloading, so that pruning

// works correctly.

void CleanupBlockRevFiles()

{

std::map<std::string, fs::path> mapBlockFiles;

// Glob all blk?????.dat and rev?????.dat files from the blocks directory.

// Remove the rev files immediately and insert the blk file paths into an

// ordered map keyed by block file index.

LogPrintf("Removing unusable blk?????.dat and rev?????.dat files for -reindex with -prune\n");

fs::path blocksdir = GetDataDir() / "blocks";

for (fs::directory_iterator it(blocksdir); it != fs::directory_iterator(); it++) {

if (fs::is_regular_file(*it) &&

it->path().filename().string().length() == 12 &&

it->path().filename().string().substr(8,4) == ".dat")

{

if (it->path().filename().string().substr(0,3) == "blk")

mapBlockFiles[it->path().filename().string().substr(3,5)] = it->path();

else if (it->path().filename().string().substr(0,3) == "rev")

remove(it->path());

}

}

// Remove all block files that aren't part of a contiguous set starting at

// zero by walking the ordered map (keys are block file indices) by

// keeping a separate counter. Once we hit a gap (or if 0 doesn't exist)

// start removing block files.

int nContigCounter = 0;

for (const std::pair<std::string, fs::path>& item : mapBlockFiles) {

if (atoi(item.first) == nContigCounter) {

nContigCounter++;

continue;

}

remove(item.second);

}

}

void ThreadImport(std::vector<fs::path> vImportFiles)

{

const CChainParams& chainparams = Params();

RenameThread("bitcoin-loadblk");

{

CImportingNow imp;

// -reindex

if (fReindex) {

int nFile = 0;

while (true) {

CDiskBlockPos pos(nFile, 0);

if (!fs::exists(GetBlockPosFilename(pos, "blk")))

break; // No block files left to reindex

FILE *file = OpenBlockFile(pos, true);

if (!file)

break; // This error is logged in OpenBlockFile

LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);

LoadExternalBlockFile(chainparams, file, &pos);

nFile++;

}

pblocktree->WriteReindexing(false);

fReindex = false;

LogPrintf("Reindexing finished\n");

// To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):

LoadGenesisBlock(chainparams);

}

// hardcoded $DATADIR/bootstrap.dat

fs::path pathBootstrap = GetDataDir() / "bootstrap.dat";

if (fs::exists(pathBootstrap)) {

FILE *file = fsbridge::fopen(pathBootstrap, "rb");

if (file) {

fs::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";

LogPrintf("Importing bootstrap.dat...\n");

LoadExternalBlockFile(chainparams, file);

RenameOver(pathBootstrap, pathBootstrapOld);

} else {

LogPrintf("Warning: Could not open bootstrap file %s\n", pathBootstrap.string());

}

}

// -loadblock=

for (const fs::path& path : vImportFiles) {

FILE *file = fsbridge::fopen(path, "rb");

if (file) {

LogPrintf("Importing blocks file %s...\n", path.string());

LoadExternalBlockFile(chainparams, file);

} else {

LogPrintf("Warning: Could not open blocks file %s\n", path.string());

}

}

// scan for better chains in the block chain database, that are not yet connected in the active best chain

CValidationState state;

if (!ActivateBestChain(state, chainparams)) {

LogPrintf("Failed to connect best block\n");

StartShutdown();

return;

}

if (gArgs.GetBoolArg("-stopafterblockimport", DEFAULT_STOPAFTERBLOCKIMPORT)) {

LogPrintf("Stopping after block import\n");

StartShutdown();

return;

}

} // End scope of CImportingNow

if (gArgs.GetArg("-persistmempool", DEFAULT_PERSIST_MEMPOOL)) {

LoadMempool();

fDumpMempoolLater = !fRequestShutdown;

}

}

/** Sanity checks

* Ensure that Bitcoin is running in a usable environment with all

* necessary library support.

*/

bool InitSanityCheck(void)

{

if(!ECC_InitSanityCheck()) {

InitError("Elliptic curve cryptography sanity check failure. Aborting.");

return false;

}

if (!glibc_sanity_test() || !glibcxx_sanity_test())

return false;

if (!Random_SanityCheck()) {

InitError("OS cryptographic RNG sanity check failure. Aborting.");

return false;

}

return true;

}

bool AppInitServers()

{

RPCServer::OnStarted(&OnRPCStarted);

RPCServer::OnStopped(&OnRPCStopped);

if (!InitHTTPServer())

return false;

if (!StartRPC())

return false;

if (!StartHTTPRPC())

return false;

if (gArgs.GetBoolArg("-rest", DEFAULT_REST_ENABLE) && !StartREST())

return false;

if (!StartHTTPServer())

return false;

return true;

}

// Parameter interaction based on rules

void InitParameterInteraction()

{

// when specifying an explicit binding address, you want to listen on it

// even when -connect or -proxy is specified

if (gArgs.IsArgSet("-bind")) {

if (gArgs.SoftSetBoolArg("-listen", true))

LogPrintf("%s: parameter interaction: -bind set -> setting -listen=1\n", __func__);

}

if (gArgs.IsArgSet("-whitebind")) {

if (gArgs.SoftSetBoolArg("-listen", true))

LogPrintf("%s: parameter interaction: -whitebind set -> setting -listen=1\n", __func__);

}

if (gArgs.IsArgSet("-connect")) {

// when only connecting to trusted nodes, do not seed via DNS, or listen by default

if (gArgs.SoftSetBoolArg("-dnsseed", false))

LogPrintf("%s: parameter interaction: -connect set -> setting -dnsseed=0\n", __func__);

if (gArgs.SoftSetBoolArg("-listen", false))

LogPrintf("%s: parameter interaction: -connect set -> setting -listen=0\n", __func__);

}

if (gArgs.IsArgSet("-proxy")) {

// to protect privacy, do not listen by default if a default proxy server is specified

if (gArgs.SoftSetBoolArg("-listen", false))

LogPrintf("%s: parameter interaction: -proxy set -> setting -listen=0\n", __func__);

// to protect privacy, do not use UPNP when a proxy is set. The user may still specify -listen=1

// to listen locally, so don't rely on this happening through -listen below.

if (gArgs.SoftSetBoolArg("-upnp", false))

LogPrintf("%s: parameter interaction: -proxy set -> setting -upnp=0\n", __func__);

// to protect privacy, do not discover addresses by default

if (gArgs.SoftSetBoolArg("-discover", false))

LogPrintf("%s: parameter interaction: -proxy set -> setting -discover=0\n", __func__);

}

if (!gArgs.GetBoolArg("-listen", DEFAULT_LISTEN)) {

// do not map ports or try to retrieve public IP when not listening (pointless)

if (gArgs.SoftSetBoolArg("-upnp", false))

LogPrintf("%s: parameter interaction: -listen=0 -> setting -upnp=0\n", __func__);

if (gArgs.SoftSetBoolArg("-discover", false))

LogPrintf("%s: parameter interaction: -listen=0 -> setting -discover=0\n", __func__);

if (gArgs.SoftSetBoolArg("-listenonion", false))

LogPrintf("%s: parameter interaction: -listen=0 -> setting -listenonion=0\n", __func__);

}

if (gArgs.IsArgSet("-externalip")) {

// if an explicit public IP is specified, do not try to find others

if (gArgs.SoftSetBoolArg("-discover", false))

LogPrintf("%s: parameter interaction: -externalip set -> setting -discover=0\n", __func__);

}

// disable whitelistrelay in blocksonly mode

if (gArgs.GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY)) {

if (gArgs.SoftSetBoolArg("-whitelistrelay", false))

LogPrintf("%s: parameter interaction: -blocksonly=1 -> setting -whitelistrelay=0\n", __func__);

}

// Forcing relay from whitelisted hosts implies we will accept relays from them in the first place.

if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) {

if (gArgs.SoftSetBoolArg("-whitelistrelay", true))

LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1\n", __func__);

}

}

static std::string ResolveErrMsg(const char * const optname, const std::string& strBind)

{

return strprintf(_("Cannot resolve -%s address: '%s'"), optname, strBind);

}

void InitLogging()

{

fPrintToConsole = gArgs.GetBoolArg("-printtoconsole", false);

fLogTimestamps = gArgs.GetBoolArg("-logtimestamps", DEFAULT_LOGTIMESTAMPS);

fLogTimeMicros = gArgs.GetBoolArg("-logtimemicros", DEFAULT_LOGTIMEMICROS);

fLogIPs = gArgs.GetBoolArg("-logips", DEFAULT_LOGIPS);

LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");

std::string version_string = FormatFullVersion();

#ifdef DEBUG

version_string += " (debug build)";

#else

version_string += " (release build)";

#endif

LogPrintf(PACKAGE_NAME " version %s\n", version_string);

}

namespace { // Variables internal to initialization process only

int nMaxConnections;

int nUserMaxConnections;

int nFD;

ServiceFlags nLocalServices = ServiceFlags(NODE_NETWORK | NODE_NETWORK_LIMITED);

} // namespace

[[noreturn]] static void new_handler_terminate()

{

// Rather than throwing std::bad-alloc if allocation fails, terminate

// immediately to (try to) avoid chain corruption.

// Since LogPrintf may itself allocate memory, set the handler directly

// to terminate first.

std::set_new_handler(std::terminate);

LogPrintf("Error: Out of memory. Terminating.\n");

// The log was successful, terminate now.

std::terminate();

};

bool AppInitBasicSetup()

{

// ********************************************************* Step 1: setup

#ifdef _MSC_VER

// Turn off Microsoft heap dump noise

_CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);

_CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, 0, 0));

// Disable confusing "helpful" text message on abort, Ctrl-C

_set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);

#endif

#ifdef WIN32

// Enable Data Execution Prevention (DEP)

// Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008

// A failure is non-critical and needs no further attention!

#ifndef PROCESS_DEP_ENABLE

// We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),

// which is not correct. Can be removed, when GCCs winbase.h is fixed!

#define PROCESS_DEP_ENABLE 0x00000001

#endif

typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);

PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");

if (setProcDEPPol != nullptr) setProcDEPPol(PROCESS_DEP_ENABLE);

#endif

if (!SetupNetworking())

return InitError("Initializing networking failed");

#ifndef WIN32

if (!gArgs.GetBoolArg("-sysperms", false)) {

umask(077);

}

// Clean shutdown on SIGTERM

registerSignalHandler(SIGTERM, HandleSIGTERM);

registerSignalHandler(SIGINT, HandleSIGTERM);

// Reopen debug.log on SIGHUP

registerSignalHandler(SIGHUP, HandleSIGHUP);

// Ignore SIGPIPE, otherwise it will bring the daemon down if the client closes unexpectedly

signal(SIGPIPE, SIG_IGN);

#else

SetConsoleCtrlHandler(consoleCtrlHandler, true);

#endif

std::set_new_handler(new_handler_terminate);

return true;

}

bool AppInitParameterInteraction()

{

const CChainParams& chainparams = Params();

// ********************************************************* Step 2: parameter interactions

// also see: InitParameterInteraction()

// if using block pruning, then disallow txindex

if (gArgs.GetArg("-prune", 0)) {

if (gArgs.GetBoolArg("-txindex", DEFAULT_TXINDEX))

return InitError(_("Prune mode is incompatible with -txindex."));

}

// -bind and -whitebind can't be set when not listening

size_t nUserBind = gArgs.GetArgs("-bind").size() + gArgs.GetArgs("-whitebind").size();

if (nUserBind != 0 && !gArgs.GetBoolArg("-listen", DEFAULT_LISTEN)) {

return InitError("Cannot set -bind or -whitebind together with -listen=0");

}

// Make sure enough file descriptors are available

int nBind = std::max(nUserBind, size_t(1));

nUserMaxConnections = gArgs.GetArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);

nMaxConnections = std::max(nUserMaxConnections, 0);

// Trim requested connection counts, to fit into system limitations

nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS)), 0);

nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS + MAX_ADDNODE_CONNECTIONS);

if (nFD < MIN_CORE_FILEDESCRIPTORS)

return InitError(_("Not enough file descriptors available."));

nMaxConnections = std::min(nFD - MIN_CORE_FILEDESCRIPTORS - MAX_ADDNODE_CONNECTIONS, nMaxConnections);

if (nMaxConnections < nUserMaxConnections)

InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, because of system limitations."), nUserMaxConnections, nMaxConnections));

// ********************************************************* Step 3: parameter-to-internal-flags

if (gArgs.IsArgSet("-debug")) {

// Special-case: if -debug=0/-nodebug is set, turn off debugging messages

const std::vector<std::string> categories = gArgs.GetArgs("-debug");

if (std::none_of(categories.begin(), categories.end(),

[](std::string cat){return cat == "0" || cat == "none";})) {

for (const auto& cat : categories) {

uint32_t flag = 0;

if (!GetLogCategory(&flag, &cat)) {

InitWarning(strprintf(_("Unsupported logging category %s=%s."), "-debug", cat));

continue;

}

logCategories |= flag;

}

}

}

// Now remove the logging categories which were explicitly excluded

for (const std::string& cat : gArgs.GetArgs("-debugexclude")) {

uint32_t flag = 0;

if (!GetLogCategory(&flag, &cat)) {

InitWarning(strprintf(_("Unsupported logging category %s=%s."), "-debugexclude", cat));

continue;

}

logCategories &= ~flag;

}

// Check for -debugnet

if (gArgs.GetBoolArg("-debugnet", false))

InitWarning(_("Unsupported argument -debugnet ignored, use -debug=net."));

// Check for -socks - as this is a privacy risk to continue, exit here

if (gArgs.IsArgSet("-socks"))

return InitError(_("Unsupported argument -socks found. Setting SOCKS version isn't possible anymore, only SOCKS5 proxies are supported."));

// Check for -tor - as this is a privacy risk to continue, exit here

if (gArgs.GetBoolArg("-tor", false))

return InitError(_("Unsupported argument -tor found, use -onion."));

if (gArgs.GetBoolArg("-benchmark", false))

InitWarning(_("Unsupported argument -benchmark ignored, use -debug=bench."));

if (gArgs.GetBoolArg("-whitelistalwaysrelay", false))

InitWarning(_("Unsupported argument -whitelistalwaysrelay ignored, use -whitelistrelay and/or -whitelistforcerelay."));

if (gArgs.IsArgSet("-blockminsize"))

InitWarning("Unsupported argument -blockminsize ignored.");

// Checkmempool and checkblockindex default to true in regtest mode

int ratio = std::min<int>(std::max<int>(gArgs.GetArg("-checkmempool", chainparams.DefaultConsistencyChecks() ? 1 : 0), 0), 1000000);

if (ratio != 0) {

mempool.setSanityCheck(1.0 / ratio);

}

fCheckBlockIndex = gArgs.GetBoolArg("-checkblockindex", chainparams.DefaultConsistencyChecks());

fCheckpointsEnabled = gArgs.GetBoolArg("-checkpoints", DEFAULT_CHECKPOINTS_ENABLED);

hashAssumeValid = uint256S(gArgs.GetArg("-assumevalid", chainparams.GetConsensus().defaultAssumeValid.GetHex()));

if (!hashAssumeValid.IsNull())

LogPrintf("Assuming ancestors of block %s have valid signatures.\n", hashAssumeValid.GetHex());

else

LogPrintf("Validating signatures for all blocks.\n");

if (gArgs.IsArgSet("-minimumchainwork")) {

const std::string minChainWorkStr = gArgs.GetArg("-minimumchainwork", "");

if (!IsHexNumber(minChainWorkStr)) {

return InitError(strprintf("Invalid non-hex (%s) minimum chain work value specified", minChainWorkStr));

}