text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin 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 "checkpoints.h"
  #include "compat/sanity.h"
  #include "key.h"
  #include "main.h"
  #include "miner.h"
  #include "net.h"
  #include "rpcserver.h"
  #include "script/standard.h"
  #include "txdb.h"
  #include "ui_interface.h"
  #include "util.h"
  #include "utilmoneystr.h"
  #ifdef ENABLE_WALLET
  #include "db.h"
  #include "wallet.h"
  #include "walletdb.h"
  #endif
  
  #include <stdint.h>
  #include <stdio.h>
  
  #ifndef WIN32
  #include <signal.h>
  #endif
  
  #include <boost/algorithm/string/predicate.hpp>
  #include <boost/algorithm/string/replace.hpp>
  #include <boost/filesystem.hpp>
  #include <boost/interprocess/sync/file_lock.hpp>
  #include <boost/thread.hpp>
  #include <openssl/crypto.h>
  
  using namespace boost;
  using namespace std;
  
  #ifdef ENABLE_WALLET
  CWallet* pwalletMain = NULL;
  #endif
  bool fFeeEstimatesInitialized = false;
  
  #ifdef WIN32
  // Win32 LevelDB doesn't use filedescriptors, and the ones used for
  // accessing block files, don't count towards to fd_set size limit
  // anyway.
  #define MIN_CORE_FILEDESCRIPTORS 0
  #else
  #define MIN_CORE_FILEDESCRIPTORS 150
  #endif
  
  extern int miningAlgo;
  
  /** Used to pass flags to the Bind() function */
  enum BindFlags {
  	BF_NONE         = 0,
  	BF_EXPLICIT     = (1U << 0),
  	BF_REPORT_ERROR = (1U << 1),
  	BF_WHITELIST    = (1U << 2),
  };
  
  static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";
  CClientUIInterface uiInterface;
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // 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 triggers
  // the DetectShutdownThread(), which interrupts the main thread group.
  // DetectShutdownThread() then exits, which causes AppInit() to
  // continue (it .joins the shutdown 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.
  //
  // Note that if running -daemon the parent process returns from AppInit2
  // before adding any threads to the threadGroup, so .join_all() returns
  // immediately and the parent exits from main().
  //
  // Shutdown for Qt is very similar, only it uses a QTimer to detect
  // fRequestShutdown getting set, and then does the normal Qt
  // shutdown thing.
  //
  
  volatile bool fRequestShutdown = false;
  
  void StartShutdown()
  {
  	fRequestShutdown = true;
  }
  bool ShutdownRequested()
  {
  	return fRequestShutdown;
  }
  
  class CCoinsViewErrorCatcher : public CCoinsViewBacked
  {
  public:
  	CCoinsViewErrorCatcher(CCoinsView* view) : CCoinsViewBacked(view) {}
  	bool GetCoins(const uint256 &txid, CCoins &coins) const {
  		try {
  			return CCoinsViewBacked::GetCoins(txid, coins);
  		} 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 interpration. 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 CCoinsViewDB *pcoinsdbview = NULL;
  static CCoinsViewErrorCatcher *pcoinscatcher = NULL;
  
  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 AppInit2() 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("DIGI-shutoff");
  	mempool.AddTransactionsUpdated(1);
  	StopRPCThreads();
  #ifdef ENABLE_WALLET
  	if (pwalletMain)
  		bitdb.Flush(false);
  	GenerateBitcoins(false, NULL, 0);
  #endif
  	StopNode();
  	UnregisterNodeSignals(GetNodeSignals());
  
  	if (fFeeEstimatesInitialized)
  	{
  		boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
  		CAutoFile est_fileout(fopen(est_path.string().c_str(), "wb"), SER_DISK, CLIENT_VERSION);
  		if (!est_fileout.IsNull())
  			mempool.WriteFeeEstimates(est_fileout);
  		else
  			LogPrintf("%s: Failed to write fee estimates to %s\n", __func__, est_path.string());
  		fFeeEstimatesInitialized = false;
  	}
  
  	{
  		LOCK(cs_main);
  		if (pcoinsTip != NULL) {
  			FlushStateToDisk();
  		}
  		delete pcoinsTip;
  		pcoinsTip = NULL;
  		delete pcoinscatcher;
  		pcoinscatcher = NULL;
  		delete pcoinsdbview;
  		pcoinsdbview = NULL;
  		delete pblocktree;
  		pblocktree = NULL;
  	}
  #ifdef ENABLE_WALLET
  if (pwalletMain)
  	bitdb.Flush(true);
  #endif
  #ifndef WIN32
  boost::filesystem::remove(GetPidFile());
  #endif
  UnregisterAllValidationInterfaces();
  #ifdef ENABLE_WALLET
  delete pwalletMain;
  pwalletMain = NULL;
  #endif
  LogPrintf("%s: done\n", __func__);
  }
  
  /**
   * Signal handlers are very limited in what they are allowed to do, so:
   */
  void HandleSIGTERM(int)
  {
  	fRequestShutdown = true;
  }
  
  void HandleSIGHUP(int)
  {
  	fReopenDebugLog = true;
  }
  
  bool static InitError(const std::string &str)
  		{
  	uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_ERROR);
  	return false;
  		}
  
  bool static InitWarning(const std::string &str)
  		{
  	uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_WARNING);
  	return true;
  		}
  
  bool static Bind(const CService &addr, unsigned int flags) {
  	if (!(flags & BF_EXPLICIT) && IsLimited(addr))
  		return false;
  	std::string strError;
  	if (!BindListenPort(addr, strError, (flags & BF_WHITELIST) != 0)) {
  		if (flags & BF_REPORT_ERROR)
  			return InitError(strError);
  		return false;
  	}
  	return true;
  }
  
  std::string HelpMessage(HelpMessageMode mode)
  {
  	//<<<<<<< HEAD
  	// When adding new options to the categories, please keep and ensure alphabetical ordering.
  	string strUsage = _("Options:") + "\n";
  	strUsage += "  -?                     " + _("This help message") + "\n";
  	strUsage += "  -alertnotify=<cmd>     " + _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)") + "\n";
  	strUsage += "  -alerts                " + strprintf(_("Receive and display P2P network alerts (default: %u)"), DEFAULT_ALERTS);
  	strUsage += "  -blocknotify=<cmd>     " + _("Execute command when the best block changes (%s in cmd is replaced by block hash)") + "\n";
  	strUsage += "  -checkblocks=<n>       " + strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), 288) + "\n";
  	strUsage += "  -checklevel=<n>        " + strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), 3) + "\n";
  	strUsage += "  -conf=<file>           " + strprintf(_("Specify configuration file (default: %s)"), "DIGI.conf") + "\n";
  	if (mode == HMM_BITCOIND)
  	{
  #if !defined(WIN32)
  		strUsage += "  -daemon                " + _("Run in the background as a daemon and accept commands") + "\n";
  #endif
  	}
  	strUsage += "  -datadir=<dir>         " + _("Specify data directory") + "\n";
  	strUsage += "  -dbcache=<n>           " + strprintf(_("Set database cache size in megabytes (%d to %d, default: %d)"), nMinDbCache, nMaxDbCache, nDefaultDbCache) + "\n";
  	strUsage += "  -loadblock=<file>      " + _("Imports blocks from external blk000??.dat file") + " " + _("on startup") + "\n";
  	strUsage += "  -maxorphantx=<n>       " + strprintf(_("Keep at most <n> unconnectable transactions in memory (default: %u)"), DEFAULT_MAX_ORPHAN_TRANSACTIONS) + "\n";
  	strUsage += "  -par=<n>               " + strprintf(_("Set the number of script verification threads (%u to %d, 0 = auto, <0 = leave that many cores free, default: %d)"), -(int)boost::thread::hardware_concurrency(), MAX_SCRIPTCHECK_THREADS, DEFAULT_SCRIPTCHECK_THREADS) + "\n";
  #ifndef WIN32
  	strUsage += "  -pid=<file>            " + strprintf(_("Specify pid file (default: %s)"), "DIGId.pid") + "\n";
  #endif
  	strUsage += "  -reindex               " + _("Rebuild block chain index from current blk000??.dat files") + " " + _("on startup") + "\n";
  #if !defined(WIN32)
  	strUsage += "  -sysperms              " + _("Create new files with system default permissions, instead of umask 077 (only effective with disabled wallet functionality)") + "\n";
  #endif
  	strUsage += "  -txindex               " + strprintf(_("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)"), 0) + "\n";
  
  	strUsage += "\n" + _("Connection options:") + "\n";
  	strUsage += "  -addnode=<ip>          " + _("Add a node to connect to and attempt to keep the connection open") + "\n";
  	strUsage += "  -banscore=<n>          " + strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), 100) + "\n";
  	strUsage += "  -bantime=<n>           " + strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), 86400) + "\n";
  	strUsage += "  -bind=<addr>           " + _("Bind to given address and always listen on it. Use [host]:port notation for IPv6") + "\n";
  	strUsage += "  -connect=<ip>          " + _("Connect only to the specified node(s)") + "\n";
  	strUsage += "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n";
  	strUsage += "  -dns                   " + _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)") + "\n";
  	strUsage += "  -dnsseed               " + _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)") + "\n";
  	strUsage += "  -externalip=<ip>       " + _("Specify your own public address") + "\n";
  	strUsage += "  -forcednsseed          " + strprintf(_("Always query for peer addresses via DNS lookup (default: %u)"), 0) + "\n";
  	strUsage += "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n";
  	strUsage += "  -maxconnections=<n>    " + strprintf(_("Maintain at most <n> connections to peers (default: %u)"), 125) + "\n";
  	strUsage += "  -maxreceivebuffer=<n>  " + strprintf(_("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)"), 5000) + "\n";
  	strUsage += "  -maxsendbuffer=<n>     " + strprintf(_("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)"), 1000) + "\n";
  	strUsage += "  -onion=<ip:port>       " + strprintf(_("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: %s)"), "-proxy") + "\n";
  	strUsage += "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (ipv4, ipv6 or onion)") + "\n";
  	strUsage += "  -permitbaremultisig    " + strprintf(_("Relay non-P2SH multisig (default: %u)"), 1) + "\n";
  	strUsage += "  -port=<port>           " + strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), 8138, 18138) + "\n";
  	strUsage += "  -proxy=<ip:port>       " + _("Connect through SOCKS5 proxy") + "\n";
  	strUsage += "  -seednode=<ip>         " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n";
  	strUsage += "  -timeout=<n>           " + strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT) + "\n";
  
  #ifdef USE_UPNP
  #if USE_UPNP
  	strUsage += "  -upnp                  " + _("Use UPnP to map the listening port (default: 1 when listening)") + "\n";
  #else
  	strUsage += "  -upnp                  " + strprintf(_("Use UPnP to map the listening port (default: %u)"), 0) + "\n";
  #endif
  #endif
  	strUsage += "  -whitebind=<addr>      " + _("Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6") + "\n";
  	strUsage += "  -whitelist=<netmask>   " + _("Whitelist peers connecting from the given netmask or IP address. Can be specified multiple times.") + "\n";
  	strUsage += "                         " + _("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") + "\n";
  
  #ifdef ENABLE_WALLET
  	strUsage += "\n" + _("Wallet options:") + "\n";
  	strUsage += "  -disablewallet         " + _("Do not load the wallet and disable wallet RPC calls") + "\n";
  	strUsage += "  -keypool=<n>           " + strprintf(_("Set key pool size to <n> (default: %u)"), 100) + "\n";
  	if (GetBoolArg("-help-debug", false))
  		strUsage += "  -mintxfee=<amt>        " + strprintf(_("Fees (in LTC/Kb) smaller than this are considered zero fee for transaction creation (default: %s)"), FormatMoney(CWallet::minTxFee.GetFeePerK())) + "\n";
  	strUsage += "  -paytxfee=<amt>        " + strprintf(_("Fee (in LTC/kB) to add to transactions you send (default: %s)"), FormatMoney(payTxFee.GetFeePerK())) + "\n";
  	strUsage += "  -mininput=<amt>        " + _("Wallet ignores inputs with value less than this (default: 0.0001)") + "\n";
  	strUsage += "  -rescan                " + _("Rescan the block chain for missing wallet transactions") + " " + _("on startup") + "\n";
  	strUsage += "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + " " + _("on startup") + "\n";
  	strUsage += "  -sendfreetransactions  " + strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), 0) + "\n";
  	strUsage += "  -spendzeroconfchange   " + strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), 1) + "\n";
  	strUsage += "  -txconfirmtarget=<n>   " + strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), 1) + "\n";
  	strUsage += "  -maxtxfee=<amt>        " + strprintf(_("Maximum total fees to use in a single wallet transaction, setting too low may abort large transactions (default: %s)"), FormatMoney(maxTxFee)) + "\n";
  	strUsage += "  -upgradewallet         " + _("Upgrade wallet to latest format") + " " + _("on startup") + "\n";
  	strUsage += "  -wallet=<file>         " + _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), "wallet.dat") + "\n";
  	strUsage += "  -walletnotify=<cmd>    " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n";
  	strUsage += "  -zapwallettxes=<mode>  " + _("Delete all wallet transactions and only recover those parts of the blockchain through -rescan on startup") + "\n";
  	strUsage += "                         " + _("(1 = keep tx meta data e.g. account owner and payment request information, 2 = drop tx meta data)") + "\n";
  #endif
  
  	strUsage += "\n" + _("Debugging/Testing options:") + "\n";
  	if (GetBoolArg("-help-debug", false))
  	{
  		strUsage += "  -checkpoints           " + strprintf(_("Only accept block chain matching built-in checkpoints (default: %u)"), 1) + "\n";
  		strUsage += "  -dblogsize=<n>         " + strprintf(_("Flush database activity from memory pool to disk log every <n> megabytes (default: %u)"), 100) + "\n";
  		strUsage += "  -disablesafemode       " + strprintf(_("Disable safemode, override a real safe mode event (default: %u)"), 0) + "\n";
  		strUsage += "  -testsafemode          " + strprintf(_("Force safe mode (default: %u)"), 0) + "\n";
  		strUsage += "  -dropmessagestest=<n>  " + _("Randomly drop 1 of every <n> network messages") + "\n";
  		strUsage += "  -fuzzmessagestest=<n>  " + _("Randomly fuzz 1 of every <n> network messages") + "\n";
  		strUsage += "  -flushwallet           " + strprintf(_("Run a thread to flush wallet periodically (default: %u)"), 1) + "\n";
  		strUsage += "  -stopafterblockimport  " + strprintf(_("Stop running after importing blocks from disk (default: %u)"), 0) + "\n";
  	}
  	strUsage += "  -debug=<category>      " + strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + "\n";
  	strUsage += "                         " + _("If <category> is not supplied, output all debugging information.") + "\n";
  	strUsage += "                         " + _("<category> can be:");
  	strUsage +=                                 " addrman, alert, bench, coindb, db, lock, rand, rpc, selectcoins, mempool, net"; // Don't translate these and qt below
  	if (mode == HMM_BITCOIN_QT)
  		strUsage += ", qt";
  	strUsage += ".\n";
  #ifdef ENABLE_WALLET
  	strUsage += "  -gen                   " + strprintf(_("Generate coins (default: %u)"), 0) + "\n";
  	strUsage += "  -genproclimit=<n>      " + strprintf(_("Set the number of threads for coin generation if enabled (-1 = all cores, default: %d)"), 1) + "\n";
  #endif
  	strUsage += "  -help-debug            " + _("Show all debugging options (usage: --help -help-debug)") + "\n";
  	strUsage += "  -logips                " + strprintf(_("Include IP addresses in debug output (default: %u)"), 0) + "\n";
  	strUsage += "  -logtimestamps         " + strprintf(_("Prepend debug output with timestamp (default: %u)"), 1) + "\n";
  	if (GetBoolArg("-help-debug", false))
  	{
  		strUsage += "  -limitfreerelay=<n>    " + strprintf(_("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default:%u)"), 15) + "\n";
  		strUsage += "  -relaypriority         " + strprintf(_("Require high priority for relaying free or low-fee transactions (default:%u)"), 1) + "\n";
  		strUsage += "  -maxsigcachesize=<n>   " + strprintf(_("Limit size of signature cache to <n> entries (default: %u)"), 50000) + "\n";
  	}
  	strUsage += "  -minrelaytxfee=<amt>   " + strprintf(_("Fees (in LTC/Kb) smaller than this are considered zero fee for relaying (default: %s)"), FormatMoney(::minRelayTxFee.GetFeePerK())) + "\n";
  	strUsage += "  -printtoconsole        " + _("Send trace/debug info to console instead of debug.log file") + "\n";
  	if (GetBoolArg("-help-debug", false))
  	{
  		strUsage += "  -printpriority         " + strprintf(_("Log transaction priority and fee per kB when mining blocks (default: %u)"), 0) + "\n";
  		strUsage += "  -privdb                " + strprintf(_("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)"), 1) + "\n";
  		strUsage += "  -regtest               " + _("Enter regression test mode, which uses a special chain in which blocks can be solved instantly.") + "\n";
  		strUsage += "                         " + _("This is intended for regression testing tools and app development.") + "\n";
  		strUsage += "                         " + _("In this mode -genproclimit controls how many blocks are generated immediately.") + "\n";
  	}
  	strUsage += "  -shrinkdebugfile       " + _("Shrink debug.log file on client startup (default: 1 when no -debug)") + "\n";
  	strUsage += "  -testnet               " + _("Use the test network") + "\n";
  
  	strUsage += "\n" + _("Node relay options:") + "\n";
  	strUsage += "  -datacarrier           " + strprintf(_("Relay and mine data carrier transactions (default: %u)"), 1) + "\n";
  	strUsage += "  -datacarriersize       " + strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY) + "\n";
  
  	strUsage += "\n" + _("Block creation options:") + "\n";
  	strUsage += "  -blockminsize=<n>      " + strprintf(_("Set minimum block size in bytes (default: %u)"), 0) + "\n";
  	strUsage += "  -blockmaxsize=<n>      " + strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE) + "\n";
  	strUsage += "  -blockprioritysize=<n> " + strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE) + "\n";
  
  	strUsage += "\n" + _("RPC server options:") + "\n";
  	strUsage += "  -server                " + _("Accept command line and JSON-RPC commands") + "\n";
  	strUsage += "  -rest                  " + strprintf(_("Accept public REST requests (default: %u)"), 0) + "\n";
  	strUsage += "  -rpcbind=<addr>        " + _("Bind to given address to listen for JSON-RPC connections. Use [host]:port notation for IPv6. This option can be specified multiple times (default: bind to all interfaces)") + "\n";
  	strUsage += "  -rpcuser=<user>        " + _("Username for JSON-RPC connections") + "\n";
  	strUsage += "  -rpcpassword=<pw>      " + _("Password for JSON-RPC connections") + "\n";
  	strUsage += "  -rpcport=<port>        " + strprintf(_("Listen for JSON-RPC connections on <port> (default: %u or testnet: %u)"), 8332, 18332) + "\n";
  	strUsage += "  -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") + "\n";
  	strUsage += "  -rpcthreads=<n>        " + strprintf(_("Set the number of threads to service RPC calls (default: %d)"), 4) + "\n";
  	strUsage += "  -rpckeepalive          " + strprintf(_("RPC support for HTTP persistent connections (default: %d)"), 0) + "\n";
  
  	strUsage += "\n" + _("RPC SSL options: (see the DIGI Wiki for SSL setup instructions)") + "\n";
  	strUsage += "  -rpcssl                                  " + _("Use OpenSSL (https) for JSON-RPC connections") + "\n";
  	strUsage += "  -rpcsslcertificatechainfile=<file.cert>  " + strprintf(_("Server certificate file (default: %s)"), "server.cert") + "\n";
  	strUsage += "  -rpcsslprivatekeyfile=<file.pem>         " + strprintf(_("Server private key (default: %s)"), "server.pem") + "\n";
  	strUsage += "  -rpcsslciphers=<ciphers>                 " + strprintf(_("Acceptable ciphers (default: %s)"), "TLSv1.2+HIGH:TLSv1+HIGH:!SSLv2:!aNULL:!eNULL:!3DES:@STRENGTH") + "\n";
  
  	return strUsage;
  }
  
  std::string LicenseInfo()
  {
  	return FormatParagraph(strprintf(_("Copyright (C) 2009-%i The Bitcoin Core Developers"), COPYRIGHT_YEAR)) + "\n" +
  			"\n" +
  			FormatParagraph(strprintf(_("Copyright (C) 2011-%i The DIGI Developers"), COPYRIGHT_YEAR)) + "\n" +
  			"\n" +
  			FormatParagraph(_("This is experimental software.")) + "\n" +
  			"\n" +
  			FormatParagraph(_("Distributed under the MIT software license, see the accompanying file COPYING or <http://www.opensource.org/licenses/mit-license.php>.")) + "\n" +
  			"\n" +
  			FormatParagraph(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <https://www.openssl.org/> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.")) +
  			"\n";
  }
  
  static void BlockNotifyCallback(const uint256& hashNewTip)
  {
  	std::string strCmd = GetArg("-blocknotify", "");
  
  	boost::replace_all(strCmd, "%s", hashNewTip.GetHex());
  	boost::thread t(runCommand, strCmd); // thread runs free
  }
  
  struct CImportingNow
  {
  	CImportingNow() {
  		assert(fImporting == false);
  		fImporting = true;
  	}
  
  	~CImportingNow() {
  		assert(fImporting == true);
  		fImporting = false;
  	}
  };
  
  void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
  {
  	RenameThread("DIGI-loadblk");
  
  	// -reindex
  	if (fReindex) {
  		CImportingNow imp;
  		int nFile = 0;
  		while (true) {
  			CDiskBlockPos pos(nFile, 0);
  			if (!boost::filesystem::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(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):
  		InitBlockIndex();
  	}
  
  	// hardcoded $DATADIR/bootstrap.dat
  	filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
  	if (filesystem::exists(pathBootstrap)) {
  		FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
  		if (file) {
  			CImportingNow imp;
  			filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
  			LogPrintf("Importing bootstrap.dat...\n");
  			LoadExternalBlockFile(file);
  			RenameOver(pathBootstrap, pathBootstrapOld);
  		} else {
  			LogPrintf("Warning: Could not open bootstrap file %s\n", pathBootstrap.string());
  		}
  	}
  
  	// -loadblock=
  	BOOST_FOREACH(boost::filesystem::path &path, vImportFiles) {
  		FILE *file = fopen(path.string().c_str(), "rb");
  		if (file) {
  			CImportingNow imp;
  			LogPrintf("Importing blocks file %s...\n", path.string());
  			LoadExternalBlockFile(file);
  		} else {
  			LogPrintf("Warning: Could not open blocks file %s\n", path.string());
  		}
  	}
  
  	if (GetBoolArg("-stopafterblockimport", false)) {
  		LogPrintf("Stopping after block import\n");
  		StartShutdown();
  	}
  }
  
  /** Sanity checks
   *  Ensure that Bitcoin is running in a usable environment with all
   *  necessary library support.
   */
  bool InitSanityCheck(void)
  {
  	if(!ECC_InitSanityCheck()) {
  		InitError("OpenSSL appears to lack support for elliptic curve cryptography. For more "
  				"information, visit https://en.bitcoin.it/wiki/OpenSSL_and_EC_Libraries");
  		return false;
  	}
  	if (!glibc_sanity_test() || !glibcxx_sanity_test())
  		return false;
  
  	return true;
  }
  
  /** Initialize bitcoin.
   *  @pre Parameters should be parsed and config file should be read.
   */
  bool AppInit2(boost::thread_group& threadGroup)
  {
  	// ********************************************************* 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, NULL, OPEN_EXISTING, 0, 0));
  #endif
  #if _MSC_VER >= 1400
  	// 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 != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);
  
  	// Initialize Windows Sockets
  	WSADATA wsadata;
  	int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
  	if (ret != NO_ERROR || LOBYTE(wsadata.wVersion ) != 2 || HIBYTE(wsadata.wVersion) != 2)
  	{
  		return InitError(strprintf("Error: Winsock library failed to start (WSAStartup returned error %d)", ret));
  	}
  #endif
  #ifndef WIN32
  
  	if (GetBoolArg("-sysperms", false)) {
  #ifdef ENABLE_WALLET
  		if (!GetBoolArg("-disablewallet", false))
  			return InitError("Error: -sysperms is not allowed in combination with enabled wallet functionality");
  #endif
  	} else {
  		umask(077);
  	}
  
  	// Clean shutdown on SIGTERM
  	struct sigaction sa;
  	sa.sa_handler = HandleSIGTERM;
  	sigemptyset(&sa.sa_mask);
  	sa.sa_flags = 0;
  	sigaction(SIGTERM, &sa, NULL);
  	sigaction(SIGINT, &sa, NULL);
  
  	// Reopen debug.log on SIGHUP
  	struct sigaction sa_hup;
  	sa_hup.sa_handler = HandleSIGHUP;
  	sigemptyset(&sa_hup.sa_mask);
  	sa_hup.sa_flags = 0;
  	sigaction(SIGHUP, &sa_hup, NULL);
  
  #if defined (__SVR4) && defined (__sun)
  	// ignore SIGPIPE on Solaris
  	signal(SIGPIPE, SIG_IGN);
  #endif
  #endif
  
  	// ********************************************************* Step 2: parameter interactions
  	// Set this early so that parameter interactions go to console
  	fPrintToConsole = GetBoolArg("-printtoconsole", false);
  	fLogTimestamps = GetBoolArg("-logtimestamps", true);
  	fLogIPs = GetBoolArg("-logips", false);
  
  	if (mapArgs.count("-bind") || mapArgs.count("-whitebind")) {
  		// when specifying an explicit binding address, you want to listen on it
  		// even when -connect or -proxy is specified
  		if (SoftSetBoolArg("-listen", true))
  			LogPrintf("AppInit2 : parameter interaction: -bind or -whitebind set -> setting -listen=1\n");
  	}
  
  	if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0) {
  		// when only connecting to trusted nodes, do not seed via DNS, or listen by default
  		if (SoftSetBoolArg("-dnsseed", false))
  			LogPrintf("AppInit2 : parameter interaction: -connect set -> setting -dnsseed=0\n");
  		if (SoftSetBoolArg("-listen", false))
  			LogPrintf("AppInit2 : parameter interaction: -connect set -> setting -listen=0\n");
  	}
  
  	if (mapArgs.count("-proxy")) {
  		// to protect privacy, do not listen by default if a default proxy server is specified
  		if (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 (SoftSetBoolArg("-upnp", false))
  			LogPrintf("%s: parameter interaction: -proxy set -> setting -upnp=0\n", __func__);
  		// to protect privacy, do not discover addresses by default
  		if (SoftSetBoolArg("-discover", false))
  			LogPrintf("AppInit2 : parameter interaction: -proxy set -> setting -discover=0\n");
  	}
  
  	if (!GetBoolArg("-listen", true)) {
  		// do not map ports or try to retrieve public IP when not listening (pointless)
  		if (SoftSetBoolArg("-upnp", false))
  			LogPrintf("AppInit2 : parameter interaction: -listen=0 -> setting -upnp=0\n");
  		if (SoftSetBoolArg("-discover", false))
  			LogPrintf("AppInit2 : parameter interaction: -listen=0 -> setting -discover=0\n");
  	}
  
  	if (mapArgs.count("-externalip")) {
  		// if an explicit public IP is specified, do not try to find others
  		if (SoftSetBoolArg("-discover", false))
  			LogPrintf("AppInit2 : parameter interaction: -externalip set -> setting -discover=0\n");
  	}
  
  	if (GetBoolArg("-salvagewallet", false)) {
  		// Rewrite just private keys: rescan to find transactions
  		if (SoftSetBoolArg("-rescan", true))
  			LogPrintf("AppInit2 : parameter interaction: -salvagewallet=1 -> setting -rescan=1\n");
  	}
  
  	// -zapwallettx implies a rescan
  	if (GetBoolArg("-zapwallettxes", false)) {
  		if (SoftSetBoolArg("-rescan", true))
  			LogPrintf("AppInit2 : parameter interaction: -zapwallettxes=<mode> -> setting -rescan=1\n");
  	}
  
  	// Algo
  	std::string strAlgo = GetArg("-algo", "scrypt");
  	transform(strAlgo.begin(),strAlgo.end(),strAlgo.begin(),::tolower);
  	if (strAlgo == "sha" || strAlgo == "sha256" || strAlgo == "sha256d")
  		miningAlgo = ALGO_SHA256D;
  	else if (strAlgo == "scrypt")
  		miningAlgo = ALGO_SCRYPT;
  	else if (strAlgo == "groestl" || strAlgo == "groestlsha2")
  		miningAlgo = ALGO_GROESTL;
  	else if (strAlgo == "skein" || strAlgo == "skeinsha2")
  		miningAlgo = ALGO_SKEIN;
  	else if (strAlgo == "q2c" || strAlgo == "qubit")
  		miningAlgo = ALGO_QUBIT;
  	else
  		miningAlgo = ALGO_SCRYPT;
  
  	// Make sure enough file descriptors are available
  	int nBind = std::max((int)mapArgs.count("-bind") + (int)mapArgs.count("-whitebind"), 1);
  	nMaxConnections = GetArg("-maxconnections", 125);
  	nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
  	int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
  	if (nFD < MIN_CORE_FILEDESCRIPTORS)
  		return InitError(_("Not enough file descriptors available."));
  	if (nFD - MIN_CORE_FILEDESCRIPTORS < nMaxConnections)
  		nMaxConnections = nFD - MIN_CORE_FILEDESCRIPTORS;
  
  	// ********************************************************* Step 3: parameter-to-internal-flags
  
  	fDebug = !mapMultiArgs["-debug"].empty();
  	// Special-case: if -debug=0/-nodebug is set, turn off debugging messages
  	const vector<string>& categories = mapMultiArgs["-debug"];
  	if (GetBoolArg("-nodebug", false) || find(categories.begin(), categories.end(), string("0")) != categories.end())
  		fDebug = false;
  
  	// Check for -debugnet
  	if (GetBoolArg("-debugnet", false))
  		InitWarning(_("Warning: Unsupported argument -debugnet ignored, use -debug=net."));
  	// Check for -socks - as this is a privacy risk to continue, exit here
  	if (mapArgs.count("-socks"))
  		return InitError(_("Error: 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 (GetBoolArg("-tor", false))
  		return InitError(_("Error: Unsupported argument -tor found, use -onion."));
  
  	if (GetBoolArg("-benchmark", false))
  		InitWarning(_("Warning: Unsupported argument -benchmark ignored, use -debug=bench."));
  
  	// Checkmempool and checkblockindex default to true in regtest mode
  	mempool.setSanityCheck(GetBoolArg("-checkmempool", Params().DefaultConsistencyChecks()));
  	fCheckBlockIndex = GetBoolArg("-checkblockindex", Params().DefaultConsistencyChecks());
  	Checkpoints::fEnabled = GetBoolArg("-checkpoints", true);
  
  	// -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
  	nScriptCheckThreads = GetArg("-par", DEFAULT_SCRIPTCHECK_THREADS);
  	if (nScriptCheckThreads <= 0)
  		nScriptCheckThreads += boost::thread::hardware_concurrency();
  	if (nScriptCheckThreads <= 1)
  		nScriptCheckThreads = 0;
  	else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS)
  		nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;
  
  	fServer = GetBoolArg("-server", false);
  #ifdef ENABLE_WALLET
  	bool fDisableWallet = GetBoolArg("-disablewallet", false);
  #endif
  
  	nConnectTimeout = GetArg("-timeout", DEFAULT_CONNECT_TIMEOUT);
  	if (nConnectTimeout <= 0)
  		nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
  
  	// Fee-per-kilobyte amount considered the same as "free"
  	// If you are mining, be careful setting this:
  	// if you set it to zero then
  	// a transaction spammer can cheaply fill blocks using
  	// 1-satoshi-fee transactions. It should be set above the real
  	// cost to you of processing a transaction.
  	if (mapArgs.count("-minrelaytxfee"))
  	{
  		CAmount n = 0;
  		if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
  			::minRelayTxFee = CFeeRate(n);
  		else
  			return InitError(strprintf(_("Invalid amount for -minrelaytxfee=<amount>: '%s'"), mapArgs["-minrelaytxfee"]));
  	}
  
  #ifdef ENABLE_WALLET
  	if (mapArgs.count("-mintxfee"))
  	{
  		CAmount n = 0;
  		if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
  			CWallet::minTxFee = CFeeRate(n);
  		else
  			return InitError(strprintf(_("Invalid amount for -mintxfee=<amount>: '%s'"), mapArgs["-mintxfee"]));
  	}
  	if (mapArgs.count("-paytxfee"))
  	{
  		CAmount nFeePerK = 0;
  		if (!ParseMoney(mapArgs["-paytxfee"], nFeePerK))
  			return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s'"), mapArgs["-paytxfee"]));
  		if (nFeePerK > nHighTransactionFeeWarning)
  			InitWarning(_("Warning: -paytxfee is set very high! This is the transaction fee you will pay if you send a transaction."));
  		payTxFee = CFeeRate(nFeePerK, 1000);
  		if (payTxFee < ::minRelayTxFee)
  		{
  			return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s' (must be at least %s)"),
  					mapArgs["-paytxfee"], ::minRelayTxFee.ToString()));
  		}
  	}
  	if (mapArgs.count("-maxtxfee"))
  	{
  		CAmount nMaxFee = 0;
  		if (!ParseMoney(mapArgs["-maxtxfee"], nMaxFee))
  			return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s'"), mapArgs["-maptxfee"]));
  		if (nMaxFee > nHighTransactionMaxFeeWarning)
  			InitWarning(_("Warning: -maxtxfee is set very high! Fees this large could be paid on a single transaction."));
  		maxTxFee = nMaxFee;
  		if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
  		{
  			return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
  					mapArgs["-maxtxfee"], ::minRelayTxFee.ToString()));
  		}
  	}
  	nTxConfirmTarget = GetArg("-txconfirmtarget", 1);
  	bSpendZeroConfChange = GetArg("-spendzeroconfchange", true);
  	fSendFreeTransactions = GetArg("-sendfreetransactions", false);
  
  	std::string strWalletFile = GetArg("-wallet", "wallet.dat");
  
  	if (mapArgs.count("-mininput"))
  	{
  		if (!ParseMoney(mapArgs["-mininput"], nMinimumInputThreshold))
  			return InitError(strprintf(_("Invalid amount for -mininput=<amount>: '%s'"), mapArgs["-mininput"]));
  	}
  
  #endif // ENABLE_WALLET
  
  	fIsBareMultisigStd = GetArg("-permitbaremultisig", true) != 0;
  	nMaxDatacarrierBytes = GetArg("-datacarriersize", nMaxDatacarrierBytes);
  
  	fAlerts = GetBoolArg("-alerts", DEFAULT_ALERTS);
  
  	// ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log
  
  	// Sanity check
  	if (!InitSanityCheck())
  		return InitError(_("Initialization sanity check failed. DIGI is shutting down."));
  
  	std::string strDataDir = GetDataDir().string();
  #ifdef ENABLE_WALLET
  	// Wallet file must be a plain filename without a directory
  	if (strWalletFile != boost::filesystem::basename(strWalletFile) + boost::filesystem::extension(strWalletFile))
  		return InitError(strprintf(_("Wallet %s resides outside data directory %s"), strWalletFile, strDataDir));
  #endif
  	// Make sure only a single Bitcoin process is using the data directory.
  	boost::filesystem::path pathLockFile = GetDataDir() / ".lock";
  	FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
  	if (file) fclose(file);
  	static boost::interprocess::file_lock lock(pathLockFile.string().c_str());
  	if (!lock.try_lock())
  		//<<<<<<< HEAD
  		return InitError(strprintf(_("Cannot obtain a lock on data directory %s. DIGI is probably already running."), strDataDir));
  #ifndef WIN32
  	CreatePidFile(GetPidFile(), getpid());
  #endif
  	if (GetBoolArg("-shrinkdebugfile", !fDebug))
  		ShrinkDebugFile();
  	LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
  	LogPrintf("DIGI version %s (%s)\n", FormatFullVersion(), CLIENT_DATE);
  	LogPrintf("Using OpenSSL version %s\n", SSLeay_version(SSLEAY_VERSION));
  #ifdef ENABLE_WALLET
  	LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
  #endif
  	if (!fLogTimestamps)
  		LogPrintf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()));
  	LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
  	LogPrintf("Using data directory %s\n", strDataDir);
  	LogPrintf("Using config file %s\n", GetConfigFile().string());
  	LogPrintf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);
  	std::ostringstream strErrors;
  
  	LogPrintf("Using %u threads for script verification\n", nScriptCheckThreads);
  	if (nScriptCheckThreads) {
  		for (int i=0; i<nScriptCheckThreads-1; i++)
  			threadGroup.create_thread(&ThreadScriptCheck);
  	}
  
  	/* Start the RPC server already.  It will be started in "warmup" mode
  	 * and not really process calls already (but it will signify connections
  	 * that the server is there and will be ready later).  Warmup mode will
  	 * be disabled when initialisation is finished.
  	 */
  	if (fServer)
  	{
  		uiInterface.InitMessage.connect(SetRPCWarmupStatus);
  		StartRPCThreads();
  	}
  
  	int64_t nStart;
  
  #if defined(USE_SSE2)
  	scrypt_detect_sse2();
  #endif
  
  	// ********************************************************* Step 5: verify wallet database integrity
  #ifdef ENABLE_WALLET
  	if (!fDisableWallet) {
  		LogPrintf("Using wallet %s\n", strWalletFile);
  		uiInterface.InitMessage(_("Verifying wallet..."));
  
  		if (!bitdb.Open(GetDataDir()))
  		{
  			// try moving the database env out of the way
  			boost::filesystem::path pathDatabase = GetDataDir() / "database";
  			boost::filesystem::path pathDatabaseBak = GetDataDir() / strprintf("database.%d.bak", GetTime());
  			try {
  				boost::filesystem::rename(pathDatabase, pathDatabaseBak);
  				LogPrintf("Moved old %s to %s. Retrying.\n", pathDatabase.string(), pathDatabaseBak.string());
  			} catch(boost::filesystem::filesystem_error &error) {
  				// failure is ok (well, not really, but it's not worse than what we started with)
  			}
  
  			// try again
  			if (!bitdb.Open(GetDataDir())) {
  				// if it still fails, it probably means we can't even create the database env
  				string msg = strprintf(_("Error initializing wallet database environment %s!"), strDataDir);
  				return InitError(msg);
  			}
  		}
  
  		if (GetBoolArg("-salvagewallet", false))
  		{
  			// Recover readable keypairs:
  			if (!CWalletDB::Recover(bitdb, strWalletFile, true))
  				return false;
  		}
  
  		if (filesystem::exists(GetDataDir() / strWalletFile))
  		{
  			CDBEnv::VerifyResult r = bitdb.Verify(strWalletFile, CWalletDB::Recover);
  			if (r == CDBEnv::RECOVER_OK)
  			{
  				string msg = strprintf(_("Warning: wallet.dat corrupt, data salvaged!"
  						" Original wallet.dat saved as wallet.{timestamp}.bak in %s; if"
  						" your balance or transactions are incorrect you should"
  						" restore from a backup."), strDataDir);
  				InitWarning(msg);
  			}
  			if (r == CDBEnv::RECOVER_FAIL)
  				return InitError(_("wallet.dat corrupt, salvage failed"));
  		}
  	} // (!fDisableWallet)
  #endif // ENABLE_WALLET
  	// ********************************************************* Step 6: network initialization
  
  	RegisterNodeSignals(GetNodeSignals());
  
  	if (mapArgs.count("-onlynet")) {
  		std::set<enum Network> nets;
  		BOOST_FOREACH(std::string snet, mapMultiArgs["-onlynet"]) {
  			enum Network net = ParseNetwork(snet);
  			if (net == NET_UNROUTABLE)
  				return InitError(strprintf(_("Unknown network specified in -onlynet: '%s'"), snet));
  			nets.insert(net);
  		}
  		for (int n = 0; n < NET_MAX; n++) {
  			enum Network net = (enum Network)n;
  			if (!nets.count(net))
  				SetLimited(net);
  		}
  	}
  
  	if (mapArgs.count("-whitelist")) {
  		BOOST_FOREACH(const std::string& net, mapMultiArgs["-whitelist"]) {
  			CSubNet subnet(net);
  			if (!subnet.IsValid())
  				return InitError(strprintf(_("Invalid netmask specified in -whitelist: '%s'"), net));
  			CNode::AddWhitelistedRange(subnet);
  		}
  	}
  
  	CService addrProxy;
  	bool fProxy = false;
  	if (mapArgs.count("-proxy")) {
  		addrProxy = CService(mapArgs["-proxy"], 9050);
  		if (!addrProxy.IsValid())
  			return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"]));
  
  		SetProxy(NET_IPV4, addrProxy);
  		SetProxy(NET_IPV6, addrProxy);
  		SetNameProxy(addrProxy);
  		fProxy = true;
  	}
  
  	// -onion can override normal proxy, -noonion disables tor entirely
  	if (!(mapArgs.count("-onion") && mapArgs["-onion"] == "0") &&
  			(fProxy || mapArgs.count("-onion"))) {
  		CService addrOnion;
  		if (!mapArgs.count("-onion"))
  			addrOnion = addrProxy;
  		else
  			addrOnion = CService(mapArgs["-onion"], 9050);
  		if (!addrOnion.IsValid())
  			return InitError(strprintf(_("Invalid -onion address: '%s'"), mapArgs["-onion"]));
  		SetProxy(NET_TOR, addrOnion);
  		SetReachable(NET_TOR);
  	}
  
  	// see Step 2: parameter interactions for more information about these
  	fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
  	fDiscover = GetBoolArg("-discover", true);
  	fNameLookup = GetBoolArg("-dns", true);
  
  	bool fBound = false;
  	if (fListen) {
  		if (mapArgs.count("-bind") || mapArgs.count("-whitebind")) {
  			BOOST_FOREACH(std::string strBind, mapMultiArgs["-bind"]) {
  				CService addrBind;
  				if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false))
  					return InitError(strprintf(_("Cannot resolve -bind address: '%s'"), strBind));
  				fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR));
  			}
  			BOOST_FOREACH(std::string strBind, mapMultiArgs["-whitebind"]) {
  				CService addrBind;
  				if (!Lookup(strBind.c_str(), addrBind, 0, false))
  					return InitError(strprintf(_("Cannot resolve -whitebind address: '%s'"), strBind));
  				if (addrBind.GetPort() == 0)
  					return InitError(strprintf(_("Need to specify a port with -whitebind: '%s'"), strBind));
  				fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR | BF_WHITELIST));
  			}
  		}
  		else {
  			struct in_addr inaddr_any;
  			inaddr_any.s_addr = INADDR_ANY;
  			fBound |= Bind(CService(in6addr_any, GetListenPort()), BF_NONE);
  			fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE);
  		}
  		if (!fBound)
  			return InitError(_("Failed to listen on any port. Use -listen=0 if you want this."));
  	}
  
  	if (mapArgs.count("-externalip")) {
  		BOOST_FOREACH(string strAddr, mapMultiArgs["-externalip"]) {
  			CService addrLocal(strAddr, GetListenPort(), fNameLookup);
  			if (!addrLocal.IsValid())
  				return InitError(strprintf(_("Cannot resolve -externalip address: '%s'"), strAddr));
  			AddLocal(CService(strAddr, GetListenPort(), fNameLookup), LOCAL_MANUAL);
  		}
  	}
  
  	BOOST_FOREACH(string strDest, mapMultiArgs["-seednode"])
  	AddOneShot(strDest);
  
  	// ********************************************************* Step 7: load block chain
  
  	fReindex = GetBoolArg("-reindex", false);
  
  	// Upgrading to 0.8; hard-link the old blknnnn.dat files into /blocks/
  	filesystem::path blocksDir = GetDataDir() / "blocks";
  	if (!filesystem::exists(blocksDir))
  	{
  		filesystem::create_directories(blocksDir);
  		bool linked = false;
  		for (unsigned int i = 1; i < 10000; i++) {
  			filesystem::path source = GetDataDir() / strprintf("blk%04u.dat", i);
  			if (!filesystem::exists(source)) break;
  			filesystem::path dest = blocksDir / strprintf("blk%05u.dat", i-1);
  			try {
  				filesystem::create_hard_link(source, dest);
  				LogPrintf("Hardlinked %s -> %s\n", source.string(), dest.string());
  				linked = true;
  			} catch (filesystem::filesystem_error & e) {
  				// Note: hardlink creation failing is not a disaster, it just means
  				// blocks will get re-downloaded from peers.
  				LogPrintf("Error hardlinking blk%04u.dat : %s\n", i, e.what());
  				break;
  			}
  		}
  		if (linked)
  		{
  			fReindex = true;
  		}
  	}
  
  	// cache size calculations
  	size_t nTotalCache = (GetArg("-dbcache", nDefaultDbCache) << 20);
  	if (nTotalCache < (nMinDbCache << 20))
  		nTotalCache = (nMinDbCache << 20); // total cache cannot be less than nMinDbCache
  	else if (nTotalCache > (nMaxDbCache << 20))
  		nTotalCache = (nMaxDbCache << 20); // total cache cannot be greater than nMaxDbCache
  	size_t nBlockTreeDBCache = nTotalCache / 8;
  	if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false))
  		nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
  	nTotalCache -= nBlockTreeDBCache;
  	size_t nCoinDBCache = nTotalCache / 2; // use half of the remaining cache for coindb cache
  	nTotalCache -= nCoinDBCache;
  	nCoinCacheSize = nTotalCache / 300; // coins in memory require around 300 bytes
  
  	bool fLoaded = false;
  	while (!fLoaded) {
  		bool fReset = fReindex;
  		std::string strLoadError;
  
  		uiInterface.InitMessage(_("Loading block index..."));
  
  		nStart = GetTimeMillis();
  		do {
  			try {
  				UnloadBlockIndex();
  				delete pcoinsTip;
  				delete pcoinsdbview;
  				delete pcoinscatcher;
  				delete pblocktree;
  
  				pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
  				pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex);
  				pcoinscatcher = new CCoinsViewErrorCatcher(pcoinsdbview);
  				pcoinsTip = new CCoinsViewCache(pcoinscatcher);
  
  				if (fReindex)
  					pblocktree->WriteReindexing(true);
  
  				if (!LoadBlockIndex()) {
  					strLoadError = _("Error loading block database");
  					break;
  				}
  
  				// If the loaded chain has a wrong genesis, bail out immediately
  				// (we're likely using a testnet datadir, or the other way around).
  				if (!mapBlockIndex.empty() && mapBlockIndex.count(Params().HashGenesisBlock()) == 0)
  					return InitError(_("Incorrect or no genesis block found. Wrong datadir for network?"));
  
  				// Initialize the block index (no-op if non-empty database was already loaded)
  				if (!InitBlockIndex()) {
  					strLoadError = _("Error initializing block database");
  					break;
  				}
  
  				// Check for changed -txindex state
  				if (fTxIndex != GetBoolArg("-txindex", false)) {
  					strLoadError = _("You need to rebuild the database using -reindex to change -txindex");
  					break;
  				}
  
  				uiInterface.InitMessage(_("Verifying blocks..."));
  				if (!CVerifyDB().VerifyDB(pcoinsdbview, GetArg("-checklevel", 3),
  						GetArg("-checkblocks", 288))) {
  					strLoadError = _("Corrupted block database detected");
  					break;
  				}
  			} catch(std::exception &e) {
  				if (fDebug) LogPrintf("%s\n", e.what());
  				strLoadError = _("Error opening block database");
  				break;
  			}
  
  			fLoaded = true;
  		} while(false);
  
  		if (!fLoaded) {
  			// first suggest a reindex
  			if (!fReset) {
  				bool fRet = uiInterface.ThreadSafeMessageBox(
  						strLoadError + ".\n\n" + _("Do you want to rebuild the block database now?"),
  						"", CClientUIInterface::MSG_ERROR | CClientUIInterface::BTN_ABORT);
  				if (fRet) {
  					fReindex = true;
  					fRequestShutdown = false;
  				} else {
  					LogPrintf("Aborted block database rebuild. Exiting.\n");
  					return false;
  				}
  			} else {
  				return InitError(strLoadError);
  			}
  		}
  	}
  
  	// As LoadBlockIndex can take several minutes, it's possible the user
  	// requested to kill the GUI during the last operation. If so, exit.
  	// As the program has not fully started yet, Shutdown() is possibly overkill.
  	if (fRequestShutdown)
  	{
  		LogPrintf("Shutdown requested. Exiting.\n");
  		return false;
  	}
  	LogPrintf(" block index %15dms\n", GetTimeMillis() - nStart);
  
  	boost::filesystem::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
  	CAutoFile est_filein(fopen(est_path.string().c_str(), "rb"), SER_DISK, CLIENT_VERSION);
  	// Allowed to fail as this file IS missing on first startup.
  	if (!est_filein.IsNull())
  		mempool.ReadFeeEstimates(est_filein);
  	fFeeEstimatesInitialized = true;
  
  	// ********************************************************* Step 8: load wallet
  #ifdef ENABLE_WALLET
  	if (fDisableWallet) {
  		pwalletMain = NULL;
  		LogPrintf("Wallet disabled!\n");
  	} else {
  
  		// needed to restore wallet transaction meta data after -zapwallettxes
  		std::vector<CWalletTx> vWtx;
  
  		if (GetBoolArg("-zapwallettxes", false)) {
  			uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
  
  			pwalletMain = new CWallet(strWalletFile);
  			DBErrors nZapWalletRet = pwalletMain->ZapWalletTx(vWtx);
  			if (nZapWalletRet != DB_LOAD_OK) {
  				uiInterface.InitMessage(_("Error loading wallet.dat: Wallet corrupted"));
  				return false;
  			}
  
  			delete pwalletMain;
  			pwalletMain = NULL;
  		}
  
  		uiInterface.InitMessage(_("Loading wallet..."));
  
  		nStart = GetTimeMillis();
  		bool fFirstRun = true;
  		pwalletMain = new CWallet(strWalletFile);
  		DBErrors nLoadWalletRet = pwalletMain->LoadWallet(fFirstRun);
  		if (nLoadWalletRet != DB_LOAD_OK)
  		{
  			if (nLoadWalletRet == DB_CORRUPT)
  				strErrors << _("Error loading wallet.dat: Wallet corrupted") << "\n";
  			else if (nLoadWalletRet == DB_NONCRITICAL_ERROR)
  			{
  				string msg(_("Warning: error reading wallet.dat! All keys read correctly, but transaction data"
  						" or address book entries might be missing or incorrect."));
  				InitWarning(msg);
  			}
  			else if (nLoadWalletRet == DB_TOO_NEW)
  				strErrors << _("Error loading wallet.dat: Wallet requires newer version of DIGI") << "\n";
  			else if (nLoadWalletRet == DB_NEED_REWRITE)
  			{
  				strErrors << _("Wallet needed to be rewritten: restart DIGI to complete") << "\n";
  				LogPrintf("%s", strErrors.str());
  				return InitError(strErrors.str());
  			}
  			else
  				strErrors << _("Error loading wallet.dat") << "\n";
  		}
  
  		if (GetBoolArg("-upgradewallet", fFirstRun))
  		{
  			int nMaxVersion = GetArg("-upgradewallet", 0);
  			if (nMaxVersion == 0) // the -upgradewallet without argument case
  			{
  				LogPrintf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
  				nMaxVersion = CLIENT_VERSION;
  				pwalletMain->SetMinVersion(FEATURE_LATEST); // permanently upgrade the wallet immediately
  			}
  			else
  				LogPrintf("Allowing wallet upgrade up to %i\n", nMaxVersion);
  			if (nMaxVersion < pwalletMain->GetVersion())
  				strErrors << _("Cannot downgrade wallet") << "\n";
  			pwalletMain->SetMaxVersion(nMaxVersion);
  		}
  
  		if (fFirstRun)
  		{
  			// Create new keyUser and set as default key
  			RandAddSeedPerfmon();
  
  			CPubKey newDefaultKey;
  			if (pwalletMain->GetKeyFromPool(newDefaultKey)) {
  				pwalletMain->SetDefaultKey(newDefaultKey);
  				if (!pwalletMain->SetAddressBook(pwalletMain->vchDefaultKey.GetID(), "", "receive"))
  					strErrors << _("Cannot write default address") << "\n";
  			}
  
  			pwalletMain->SetBestChain(chainActive.GetLocator());
  		}
  
  		LogPrintf("%s", strErrors.str());
  		LogPrintf(" wallet      %15dms\n", GetTimeMillis() - nStart);
  
  		RegisterValidationInterface(pwalletMain);
  
  		CBlockIndex *pindexRescan = chainActive.Tip();
  		if (GetBoolArg("-rescan", false))
  			pindexRescan = chainActive.Genesis();
  		else
  		{
  			CWalletDB walletdb(strWalletFile);
  			CBlockLocator locator;
  			if (walletdb.ReadBestBlock(locator))
  				pindexRescan = FindForkInGlobalIndex(chainActive, locator);
  			else
  				pindexRescan = chainActive.Genesis();
  		}
  		if (chainActive.Tip() && chainActive.Tip() != pindexRescan)
  		{
  			uiInterface.InitMessage(_("Rescanning..."));
  			LogPrintf("Rescanning last %i blocks (from block %i)...\n", chainActive.Height() - pindexRescan->nHeight, pindexRescan->nHeight);
  			nStart = GetTimeMillis();
  			pwalletMain->ScanForWalletTransactions(pindexRescan, true);
  			LogPrintf(" rescan      %15dms\n", GetTimeMillis() - nStart);
  			pwalletMain->SetBestChain(chainActive.GetLocator());
  			nWalletDBUpdated++;
  
  			// Restore wallet transaction metadata after -zapwallettxes=1
  			if (GetBoolArg("-zapwallettxes", false) && GetArg("-zapwallettxes", "1") != "2")
  			{
  				BOOST_FOREACH(const CWalletTx& wtxOld, vWtx)
                  		{
  					uint256 hash = wtxOld.GetHash();
  					std::map<uint256, CWalletTx>::iterator mi = pwalletMain->mapWallet.find(hash);
  					if (mi != pwalletMain->mapWallet.end())
  					{
  						const CWalletTx* copyFrom = &wtxOld;
  						CWalletTx* copyTo = &mi->second;
  						copyTo->mapValue = copyFrom->mapValue;
  						copyTo->vOrderForm = copyFrom->vOrderForm;
  						copyTo->nTimeReceived = copyFrom->nTimeReceived;
  						copyTo->nTimeSmart = copyFrom->nTimeSmart;
  						copyTo->fFromMe = copyFrom->fFromMe;
  						copyTo->strFromAccount = copyFrom->strFromAccount;
  						copyTo->nOrderPos = copyFrom->nOrderPos;
  						copyTo->WriteToDisk();
  					}
                  		}
  			}
  		}
  	} // (!fDisableWallet)
  #else // ENABLE_WALLET
  	LogPrintf("No wallet compiled in!\n");
  #endif // !ENABLE_WALLET
  	// ********************************************************* Step 9: import blocks
  
  	if (mapArgs.count("-blocknotify"))
  		uiInterface.NotifyBlockTip.connect(BlockNotifyCallback);
  
  	// scan for better chains in the block chain database, that are not yet connected in the active best chain
  	CValidationState state;
  	if (!ActivateBestChain(state))
  		strErrors << "Failed to connect best block";
  
  	std::vector<boost::filesystem::path> vImportFiles;
  	if (mapArgs.count("-loadblock"))
  	{
  		BOOST_FOREACH(string strFile, mapMultiArgs["-loadblock"])
              		vImportFiles.push_back(strFile);
  	}
  	threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));
  	if (chainActive.Tip() == NULL) {
  		LogPrintf("Waiting for genesis block to be imported...\n");
  		while (!fRequestShutdown && chainActive.Tip() == NULL)
  			MilliSleep(10);
  	}
  
  	// ********************************************************* Step 10: start node
  
  	if (!CheckDiskSpace())
  		return false;
  
  	if (!strErrors.str().empty())
  		return InitError(strErrors.str());
  
  	RandAddSeedPerfmon();
  
  	//// debug print
  	LogPrintf("mapBlockIndex.size() = %u\n",   mapBlockIndex.size());
  	LogPrintf("nBestHeight = %d\n",                   chainActive.Height());
  #ifdef ENABLE_WALLET
  	LogPrintf("setKeyPool.size() = %u\n",      pwalletMain ? pwalletMain->setKeyPool.size() : 0);
  	LogPrintf("mapWallet.size() = %u\n",       pwalletMain ? pwalletMain->mapWallet.size() : 0);
  	LogPrintf("mapAddressBook.size() = %u\n",  pwalletMain ? pwalletMain->mapAddressBook.size() : 0);
  #endif
  
  	StartNode(threadGroup);
  
  #ifdef ENABLE_WALLET
  	// Generate coins in the background
  	if (pwalletMain)
  		GenerateBitcoins(GetBoolArg("-gen", false), pwalletMain, GetArg("-genproclimit", 1));
  #endif
  
  	// ********************************************************* Step 11: finished
  
  	SetRPCWarmupFinished();
  	uiInterface.InitMessage(_("Done loading"));
  
  #ifdef ENABLE_WALLET
  	if (pwalletMain) {
  		// Add wallet transactions that aren't already in a block to mapTransactions
  		pwalletMain->ReacceptWalletTransactions();
  
  		// Run a thread to flush wallet periodically
  		threadGroup.create_thread(boost::bind(&ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));
  	}
  #endif
  
  	return !fRequestShutdown;
  }
  