util.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "headers.h"
   6
   7
   8 map<string, string> mapArgs;
   9 map<string, vector<string> > mapMultiArgs;
  10 bool fDebug = false;
  11 bool fPrintToConsole = false;
  12 bool fPrintToDebugger = false;
  13 char pszSetDataDir[MAX_PATH] = "";
  14 bool fRequestShutdown = false;
  15 bool fShutdown = false;
  16 bool fDaemon = false;
  17 bool fCommandLine = false;
  18 string strMiscWarning;
  19 bool fTestNet = false;
  20
  21
  22
  23
  24
  25 // Workaround for "multiple definition of `_tls_used'"
  26 // http://svn.boost.org/trac/boost/ticket/4258
  27 extern "C" void tss_cleanup_implemented() { }
  28
  29
  30
  31
  32
  33 // Init openssl library multithreading support
  34 static boost::interprocess::interprocess_mutex** ppmutexOpenSSL;
  35 void locking_callback(int mode, int i, const char* file, int line)
  36 {
  37     if (mode & CRYPTO_LOCK)
  38         ppmutexOpenSSL[i]->lock();
  39     else
  40         ppmutexOpenSSL[i]->unlock();
  41 }
  42
  43 // Init
  44 class CInit
  45 {
  46 public:
  47     CInit()
  48     {
  49         // Init openssl library multithreading support
  50         ppmutexOpenSSL = (boost::interprocess::interprocess_mutex**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(boost::interprocess::interprocess_mutex*));
  51         for (int i = 0; i < CRYPTO_num_locks(); i++)
  52             ppmutexOpenSSL[i] = new boost::interprocess::interprocess_mutex();
  53         CRYPTO_set_locking_callback(locking_callback);
  54
  55 #ifdef __WXMSW__
  56         // Seed random number generator with screen scrape and other hardware sources
  57         RAND_screen();
  58 #endif
  59
  60         // Seed random number generator with performance counter
  61         RandAddSeed();
  62     }
  63     ~CInit()
  64     {
  65         // Shutdown openssl library multithreading support
  66         CRYPTO_set_locking_callback(NULL);
  67         for (int i = 0; i < CRYPTO_num_locks(); i++)
  68             delete ppmutexOpenSSL[i];
  69         OPENSSL_free(ppmutexOpenSSL);
  70     }
  71 }
  72 instance_of_cinit;
  73
  74
  75
  76
  77
  78
  79
  80
  81 void RandAddSeed()
  82 {
  83     // Seed with CPU performance counter
  84     int64 nCounter = GetPerformanceCounter();
  85     RAND_add(&nCounter, sizeof(nCounter), 1.5);
  86     memset(&nCounter, 0, sizeof(nCounter));
  87 }
  88
  89 void RandAddSeedPerfmon()
  90 {
  91     RandAddSeed();
  92
  93     // This can take up to 2 seconds, so only do it every 10 minutes
  94     static int64 nLastPerfmon;
  95     if (GetTime() < nLastPerfmon + 10 * 60)
  96         return;
  97     nLastPerfmon = GetTime();
  98
  99 #ifdef __WXMSW__
 100     // Don't need this on Linux, OpenSSL automatically uses /dev/urandom
 101     // Seed with the entire set of perfmon data
 102     unsigned char pdata[250000];
 103     memset(pdata, 0, sizeof(pdata));
 104     unsigned long nSize = sizeof(pdata);
 105     long ret = RegQueryValueExA(HKEY_PERFORMANCE_DATA, "Global", NULL, NULL, pdata, &nSize);
 106     RegCloseKey(HKEY_PERFORMANCE_DATA);
 107     if (ret == ERROR_SUCCESS)
 108     {
 109         RAND_add(pdata, nSize, nSize/100.0);
 110         memset(pdata, 0, nSize);
 111         printf("%s RandAddSeed() %d bytes\n", DateTimeStrFormat("%x %H:%M", GetTime()).c_str(), nSize);
 112     }
 113 #endif
 114 }
 115
 116 uint64 GetRand(uint64 nMax)
 117 {
 118     if (nMax == 0)
 119         return 0;
 120
 121     // The range of the random source must be a multiple of the modulus
 122     // to give every possible output value an equal possibility
 123     uint64 nRange = (UINT64_MAX / nMax) * nMax;
 124     uint64 nRand = 0;
 125     do
 126         RAND_bytes((unsigned char*)&nRand, sizeof(nRand));
 127     while (nRand >= nRange);
 128     return (nRand % nMax);
 129 }
 130
 131 int GetRandInt(int nMax)
 132 {
 133     return GetRand(nMax);
 134 }
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146 inline int OutputDebugStringF(const char* pszFormat, ...)
 147 {
 148     int ret = 0;
 149     if (fPrintToConsole)
 150     {
 151         // print to console
 152         va_list arg_ptr;
 153         va_start(arg_ptr, pszFormat);
 154         ret = vprintf(pszFormat, arg_ptr);
 155         va_end(arg_ptr);
 156     }
 157     else
 158     {
 159         // print to debug.log
 160         static FILE* fileout = NULL;
 161
 162         if (!fileout)
 163         {
 164             char pszFile[MAX_PATH+100];
 165             GetDataDir(pszFile);
 166             strlcat(pszFile, "/debug.log", sizeof(pszFile));
 167             fileout = fopen(pszFile, "a");
 168             setbuf(fileout, NULL); // unbuffered
 169         }
 170         if (fileout)
 171         {
 172             //// Debug print useful for profiling
 173             //fprintf(fileout, " %"PRI64d" ", GetTimeMillis());
 174             va_list arg_ptr;
 175             va_start(arg_ptr, pszFormat);
 176             ret = vfprintf(fileout, pszFormat, arg_ptr);
 177             va_end(arg_ptr);
 178             fflush(fileout);
 179         }
 180     }
 181
 182 #ifdef __WXMSW__
 183     if (fPrintToDebugger)
 184     {
 185         static CCriticalSection cs_OutputDebugStringF;
 186
 187         // accumulate a line at a time
 188         CRITICAL_BLOCK(cs_OutputDebugStringF)
 189         {
 190             static char pszBuffer[50000];
 191             static char* pend;
 192             if (pend == NULL)
 193                 pend = pszBuffer;
 194             va_list arg_ptr;
 195             va_start(arg_ptr, pszFormat);
 196             int limit = END(pszBuffer) - pend - 2;
 197             int ret = _vsnprintf(pend, limit, pszFormat, arg_ptr);
 198             va_end(arg_ptr);
 199             if (ret < 0 || ret >= limit)
 200             {
 201                 pend = END(pszBuffer) - 2;
 202                 *pend++ = '\n';
 203             }
 204             else
 205                 pend += ret;
 206             *pend = '\0';
 207             char* p1 = pszBuffer;
 208             char* p2;
 209             while (p2 = strchr(p1, '\n'))
 210             {
 211                 p2++;
 212                 char c = *p2;
 213                 *p2 = '\0';
 214                 OutputDebugStringA(p1);
 215                 *p2 = c;
 216                 p1 = p2;
 217             }
 218             if (p1 != pszBuffer)
 219                 memmove(pszBuffer, p1, pend - p1 + 1);
 220             pend -= (p1 - pszBuffer);
 221         }
 222     }
 223 #endif
 224     return ret;
 225 }
 226
 227
 228 // Safer snprintf
 229 //  - prints up to limit-1 characters
 230 //  - output string is always null terminated even if limit reached
 231 //  - return value is the number of characters actually printed
 232 int my_snprintf(char* buffer, size_t limit, const char* format, ...)
 233 {
 234     if (limit == 0)
 235         return 0;
 236     va_list arg_ptr;
 237     va_start(arg_ptr, format);
 238     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
 239     va_end(arg_ptr);
 240     if (ret < 0 || ret >= limit)
 241     {
 242         ret = limit - 1;
 243         buffer[limit-1] = 0;
 244     }
 245     return ret;
 246 }
 247
 248
 249 string strprintf(const char* format, ...)
 250 {
 251     char buffer[50000];
 252     char* p = buffer;
 253     int limit = sizeof(buffer);
 254     int ret;
 255     loop
 256     {
 257         va_list arg_ptr;
 258         va_start(arg_ptr, format);
 259         ret = _vsnprintf(p, limit, format, arg_ptr);
 260         va_end(arg_ptr);
 261         if (ret >= 0 && ret < limit)
 262             break;
 263         if (p != buffer)
 264             delete p;
 265         limit *= 2;
 266         p = new char[limit];
 267         if (p == NULL)
 268             throw std::bad_alloc();
 269     }
 270     string str(p, p+ret);
 271     if (p != buffer)
 272         delete p;
 273     return str;
 274 }
 275
 276
 277 bool error(const char* format, ...)
 278 {
 279     char buffer[50000];
 280     int limit = sizeof(buffer);
 281     va_list arg_ptr;
 282     va_start(arg_ptr, format);
 283     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
 284     va_end(arg_ptr);
 285     if (ret < 0 || ret >= limit)
 286     {
 287         ret = limit - 1;
 288         buffer[limit-1] = 0;
 289     }
 290     printf("ERROR: %s\n", buffer);
 291     return false;
 292 }
 293
 294
 295 void ParseString(const string& str, char c, vector<string>& v)
 296 {
 297     if (str.empty())
 298         return;
 299     string::size_type i1 = 0;
 300     string::size_type i2;
 301     loop
 302     {
 303         i2 = str.find(c, i1);
 304         if (i2 == str.npos)
 305         {
 306             v.push_back(str.substr(i1));
 307             return;
 308         }
 309         v.push_back(str.substr(i1, i2-i1));
 310         i1 = i2+1;
 311     }
 312 }
 313
 314
 315 string FormatMoney(int64 n, bool fPlus)
 316 {
 317     n /= CENT;
 318     string str = strprintf("%"PRI64d".%02"PRI64d, (n > 0 ? n : -n)/100, (n > 0 ? n : -n)%100);
 319     for (int i = 6; i < str.size(); i += 4)
 320         if (isdigit(str[str.size() - i - 1]))
 321             str.insert(str.size() - i, 1, ',');
 322     if (n < 0)
 323         str.insert((unsigned int)0, 1, '-');
 324     else if (fPlus && n > 0)
 325         str.insert((unsigned int)0, 1, '+');
 326     return str;
 327 }
 328
 329
 330 bool ParseMoney(const string& str, int64& nRet)
 331 {
 332     return ParseMoney(str.c_str(), nRet);
 333 }
 334
 335 bool ParseMoney(const char* pszIn, int64& nRet)
 336 {
 337     string strWhole;
 338     int64 nCents = 0;
 339     const char* p = pszIn;
 340     while (isspace(*p))
 341         p++;
 342     for (; *p; p++)
 343     {
 344         if (*p == ',' && p > pszIn && isdigit(p[-1]) && isdigit(p[1]) && isdigit(p[2]) && isdigit(p[3]) && !isdigit(p[4]))
 345             continue;
 346         if (*p == '.')
 347         {
 348             p++;
 349             if (isdigit(*p))
 350             {
 351                 nCents = 10 * (*p++ - '0');
 352                 if (isdigit(*p))
 353                     nCents += (*p++ - '0');
 354             }
 355             break;
 356         }
 357         if (isspace(*p))
 358             break;
 359         if (!isdigit(*p))
 360             return false;
 361         strWhole.insert(strWhole.end(), *p);
 362     }
 363     for (; *p; p++)
 364         if (!isspace(*p))
 365             return false;
 366     if (strWhole.size() > 14)
 367         return false;
 368     if (nCents < 0 || nCents > 99)
 369         return false;
 370     int64 nWhole = atoi64(strWhole);
 371     int64 nPreValue = nWhole * 100 + nCents;
 372     int64 nValue = nPreValue * CENT;
 373     if (nValue / CENT != nPreValue)
 374         return false;
 375     if (nValue / COIN != nWhole)
 376         return false;
 377     nRet = nValue;
 378     return true;
 379 }
 380
 381
 382 vector<unsigned char> ParseHex(const char* psz)
 383 {
 384     static char phexdigit[256] =
 385     { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 386       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 387       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 388       0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,
 389       -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 390       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 391       -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1
 392       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 393       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 394       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 395       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 396       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 397       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 398       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 399       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 400       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
 401
 402     // convert hex dump to vector
 403     vector<unsigned char> vch;
 404     loop
 405     {
 406         while (isspace(*psz))
 407             psz++;
 408         char c = phexdigit[(unsigned char)*psz++];
 409         if (c == -1)
 410             break;
 411         unsigned char n = (c << 4);
 412         c = phexdigit[(unsigned char)*psz++];
 413         if (c == -1)
 414             break;
 415         n |= c;
 416         vch.push_back(n);
 417     }
 418     return vch;
 419 }
 420
 421 vector<unsigned char> ParseHex(const string& str)
 422 {
 423     return ParseHex(str.c_str());
 424 }
 425
 426
 427 void ParseParameters(int argc, char* argv[])
 428 {
 429     mapArgs.clear();
 430     mapMultiArgs.clear();
 431     for (int i = 1; i < argc; i++)
 432     {
 433         char psz[10000];
 434         strlcpy(psz, argv[i], sizeof(psz));
 435         char* pszValue = (char*)"";
 436         if (strchr(psz, '='))
 437         {
 438             pszValue = strchr(psz, '=');
 439             *pszValue++ = '\0';
 440         }
 441         #ifdef __WXMSW__
 442         _strlwr(psz);
 443         if (psz[0] == '/')
 444             psz[0] = '-';
 445         #endif
 446         if (psz[0] != '-')
 447             break;
 448         mapArgs[psz] = pszValue;
 449         mapMultiArgs[psz].push_back(pszValue);
 450     }
 451 }
 452
 453
 454 const char* wxGetTranslation(const char* pszEnglish)
 455 {
 456 #ifdef GUI
 457     // Wrapper of wxGetTranslation returning the same const char* type as was passed in
 458     static CCriticalSection cs;
 459     CRITICAL_BLOCK(cs)
 460     {
 461         // Look in cache
 462         static map<string, char*> mapCache;
 463         map<string, char*>::iterator mi = mapCache.find(pszEnglish);
 464         if (mi != mapCache.end())
 465             return (*mi).second;
 466
 467         // wxWidgets translation
 468         wxString strTranslated = wxGetTranslation(wxString(pszEnglish, wxConvUTF8));
 469
 470         // We don't cache unknown strings because caller might be passing in a
 471         // dynamic string and we would keep allocating memory for each variation.
 472         if (strcmp(pszEnglish, strTranslated.utf8_str()) == 0)
 473             return pszEnglish;
 474
 475         // Add to cache, memory doesn't need to be freed.  We only cache because
 476         // we must pass back a pointer to permanently allocated memory.
 477         char* pszCached = new char[strlen(strTranslated.utf8_str())+1];
 478         strcpy(pszCached, strTranslated.utf8_str());
 479         mapCache[pszEnglish] = pszCached;
 480         return pszCached;
 481     }
 482     return NULL;
 483 #else
 484     return pszEnglish;
 485 #endif
 486 }
 487
 488
 489 bool WildcardMatch(const char* psz, const char* mask)
 490 {
 491     loop
 492     {
 493         switch (*mask)
 494         {
 495         case '\0':
 496             return (*psz == '\0');
 497         case '*':
 498             return WildcardMatch(psz, mask+1) || (*psz && WildcardMatch(psz+1, mask));
 499         case '?':
 500             if (*psz == '\0')
 501                 return false;
 502             break;
 503         default:
 504             if (*psz != *mask)
 505                 return false;
 506             break;
 507         }
 508         psz++;
 509         mask++;
 510     }
 511 }
 512
 513 bool WildcardMatch(const string& str, const string& mask)
 514 {
 515     return WildcardMatch(str.c_str(), mask.c_str());
 516 }
 517
 518
 519
 520
 521
 522
 523
 524
 525 void FormatException(char* pszMessage, std::exception* pex, const char* pszThread)
 526 {
 527 #ifdef __WXMSW__
 528     char pszModule[MAX_PATH];
 529     pszModule[0] = '\0';
 530     GetModuleFileNameA(NULL, pszModule, sizeof(pszModule));
 531 #else
 532     const char* pszModule = "bitcoin";
 533 #endif
 534     if (pex)
 535         snprintf(pszMessage, 1000,
 536             "EXCEPTION: %s       \n%s       \n%s in %s       \n", typeid(*pex).name(), pex->what(), pszModule, pszThread);
 537     else
 538         snprintf(pszMessage, 1000,
 539             "UNKNOWN EXCEPTION       \n%s in %s       \n", pszModule, pszThread);
 540 }
 541
 542 void LogException(std::exception* pex, const char* pszThread)
 543 {
 544     char pszMessage[10000];
 545     FormatException(pszMessage, pex, pszThread);
 546     printf("\n%s", pszMessage);
 547 }
 548
 549 void PrintException(std::exception* pex, const char* pszThread)
 550 {
 551     char pszMessage[10000];
 552     FormatException(pszMessage, pex, pszThread);
 553     printf("\n\n************************\n%s\n", pszMessage);
 554     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 555     strMiscWarning = pszMessage;
 556 #ifdef GUI
 557     if (wxTheApp && !fDaemon)
 558         MyMessageBox(pszMessage, "Bitcoin", wxOK | wxICON_ERROR);
 559 #endif
 560     throw;
 561 }
 562
 563 void ThreadOneMessageBox(string strMessage)
 564 {
 565     // Skip message boxes if one is already open
 566     static bool fMessageBoxOpen;
 567     if (fMessageBoxOpen)
 568         return;
 569     fMessageBoxOpen = true;
 570     ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
 571     fMessageBoxOpen = false;
 572 }
 573
 574 void PrintExceptionContinue(std::exception* pex, const char* pszThread)
 575 {
 576     char pszMessage[10000];
 577     FormatException(pszMessage, pex, pszThread);
 578     printf("\n\n************************\n%s\n", pszMessage);
 579     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 580     strMiscWarning = pszMessage;
 581 #ifdef GUI
 582     if (wxTheApp && !fDaemon)
 583         boost::thread(boost::bind(ThreadOneMessageBox, string(pszMessage)));
 584 #endif
 585 }
 586
 587
 588
 589
 590
 591
 592
 593
 594 #ifdef __WXMSW__
 595 typedef WINSHELLAPI BOOL (WINAPI *PSHGETSPECIALFOLDERPATHA)(HWND hwndOwner, LPSTR lpszPath, int nFolder, BOOL fCreate);
 596
 597 string MyGetSpecialFolderPath(int nFolder, bool fCreate)
 598 {
 599     char pszPath[MAX_PATH+100] = "";
 600
 601     // SHGetSpecialFolderPath isn't always available on old Windows versions
 602     HMODULE hShell32 = LoadLibraryA("shell32.dll");
 603     if (hShell32)
 604     {
 605         PSHGETSPECIALFOLDERPATHA pSHGetSpecialFolderPath =
 606             (PSHGETSPECIALFOLDERPATHA)GetProcAddress(hShell32, "SHGetSpecialFolderPathA");
 607         if (pSHGetSpecialFolderPath)
 608             (*pSHGetSpecialFolderPath)(NULL, pszPath, nFolder, fCreate);
 609         FreeModule(hShell32);
 610     }
 611
 612     // Backup option
 613     if (pszPath[0] == '\0')
 614     {
 615         if (nFolder == CSIDL_STARTUP)
 616         {
 617             strcpy(pszPath, getenv("USERPROFILE"));
 618             strcat(pszPath, "\\Start Menu\\Programs\\Startup");
 619         }
 620         else if (nFolder == CSIDL_APPDATA)
 621         {
 622             strcpy(pszPath, getenv("APPDATA"));
 623         }
 624     }
 625
 626     return pszPath;
 627 }
 628 #endif
 629
 630 string GetDefaultDataDir()
 631 {
 632     // Windows: C:\Documents and Settings\username\Application Data\Bitcoin
 633     // Mac: ~/Library/Application Support/Bitcoin
 634     // Unix: ~/.bitcoin
 635 #ifdef __WXMSW__
 636     // Windows
 637     return MyGetSpecialFolderPath(CSIDL_APPDATA, true) + "\\Bitcoin";
 638 #else
 639     char* pszHome = getenv("HOME");
 640     if (pszHome == NULL || strlen(pszHome) == 0)
 641         pszHome = (char*)"/";
 642     string strHome = pszHome;
 643     if (strHome[strHome.size()-1] != '/')
 644         strHome += '/';
 645 #ifdef __WXMAC_OSX__
 646     // Mac
 647     strHome += "Library/Application Support/";
 648     filesystem::create_directory(strHome.c_str());
 649     return strHome + "Bitcoin";
 650 #else
 651     // Unix
 652     return strHome + ".bitcoin";
 653 #endif
 654 #endif
 655 }
 656
 657 void GetDataDir(char* pszDir)
 658 {
 659     // pszDir must be at least MAX_PATH length.
 660     int nVariation;
 661     if (pszSetDataDir[0] != 0)
 662     {
 663         strlcpy(pszDir, pszSetDataDir, MAX_PATH);
 664         nVariation = 0;
 665     }
 666     else
 667     {
 668         // This can be called during exceptions by printf, so we cache the
 669         // value so we don't have to do memory allocations after that.
 670         static char pszCachedDir[MAX_PATH];
 671         if (pszCachedDir[0] == 0)
 672             strlcpy(pszCachedDir, GetDefaultDataDir().c_str(), sizeof(pszCachedDir));
 673         strlcpy(pszDir, pszCachedDir, MAX_PATH);
 674         nVariation = 1;
 675     }
 676     if (fTestNet)
 677     {
 678         char* p = pszDir + strlen(pszDir);
 679         if (p > pszDir && p[-1] != '/' && p[-1] != '\\')
 680             *p++ = '/';
 681         strcpy(p, "testnet");
 682         nVariation += 2;
 683     }
 684     static bool pfMkdir[4];
 685     if (!pfMkdir[nVariation])
 686     {
 687         pfMkdir[nVariation] = true;
 688         filesystem::create_directory(pszDir);
 689     }
 690 }
 691
 692 string GetDataDir()
 693 {
 694     char pszDir[MAX_PATH];
 695     GetDataDir(pszDir);
 696     return pszDir;
 697 }
 698
 699 string GetConfigFile()
 700 {
 701     namespace fs = boost::filesystem;
 702     fs::path pathConfig(GetArg("-conf", "bitcoin.conf"));
 703     if (!pathConfig.is_complete())
 704         pathConfig = fs::path(GetDataDir()) / pathConfig;
 705     return pathConfig.string();
 706 }
 707
 708 void ReadConfigFile(map<string, string>& mapSettingsRet,
 709                     map<string, vector<string> >& mapMultiSettingsRet)
 710 {
 711     namespace fs = boost::filesystem;
 712     namespace pod = boost::program_options::detail;
 713
 714     fs::ifstream streamConfig(GetConfigFile());
 715     if (!streamConfig.good())
 716         return;
 717
 718     set<string> setOptions;
 719     setOptions.insert("*");
 720
 721     for (pod::config_file_iterator it(streamConfig, setOptions), end; it != end; ++it)
 722     {
 723         // Don't overwrite existing settings so command line settings override bitcoin.conf
 724         string strKey = string("-") + it->string_key;
 725         if (mapSettingsRet.count(strKey) == 0)
 726             mapSettingsRet[strKey] = it->value[0];
 727         mapMultiSettingsRet[strKey].push_back(it->value[0]);
 728     }
 729 }
 730
 731 int GetFilesize(FILE* file)
 732 {
 733     int nSavePos = ftell(file);
 734     int nFilesize = -1;
 735     if (fseek(file, 0, SEEK_END) == 0)
 736         nFilesize = ftell(file);
 737     fseek(file, nSavePos, SEEK_SET);
 738     return nFilesize;
 739 }
 740
 741 void ShrinkDebugFile()
 742 {
 743     // Scroll debug.log if it's getting too big
 744     string strFile = GetDataDir() + "/debug.log";
 745     FILE* file = fopen(strFile.c_str(), "r");
 746     if (file && GetFilesize(file) > 10 * 1000000)
 747     {
 748         // Restart the file with some of the end
 749         char pch[200000];
 750         fseek(file, -sizeof(pch), SEEK_END);
 751         int nBytes = fread(pch, 1, sizeof(pch), file);
 752         fclose(file);
 753         if (file = fopen(strFile.c_str(), "w"))
 754         {
 755             fwrite(pch, 1, nBytes, file);
 756             fclose(file);
 757         }
 758     }
 759 }
 760
 761
 762
 763
 764
 765
 766
 767
 768 //
 769 // "Never go to sea with two chronometers; take one or three."
 770 // Our three time sources are:
 771 //  - System clock
 772 //  - Median of other nodes's clocks
 773 //  - The user (asking the user to fix the system clock if the first two disagree)
 774 //
 775 int64 GetTime()
 776 {
 777     return time(NULL);
 778 }
 779
 780 static int64 nTimeOffset = 0;
 781
 782 int64 GetAdjustedTime()
 783 {
 784     return GetTime() + nTimeOffset;
 785 }
 786
 787 void AddTimeData(unsigned int ip, int64 nTime)
 788 {
 789     int64 nOffsetSample = nTime - GetTime();
 790
 791     // Ignore duplicates
 792     static set<unsigned int> setKnown;
 793     if (!setKnown.insert(ip).second)
 794         return;
 795
 796     // Add data
 797     static vector<int64> vTimeOffsets;
 798     if (vTimeOffsets.empty())
 799         vTimeOffsets.push_back(0);
 800     vTimeOffsets.push_back(nOffsetSample);
 801     printf("Added time data, samples %d, offset %+"PRI64d" (%+"PRI64d" minutes)\n", vTimeOffsets.size(), vTimeOffsets.back(), vTimeOffsets.back()/60);
 802     if (vTimeOffsets.size() >= 5 && vTimeOffsets.size() % 2 == 1)
 803     {
 804         sort(vTimeOffsets.begin(), vTimeOffsets.end());
 805         int64 nMedian = vTimeOffsets[vTimeOffsets.size()/2];
 806         // Only let other nodes change our time by so much
 807         if (abs64(nMedian) < 70 * 60)
 808         {
 809             nTimeOffset = nMedian;
 810         }
 811         else
 812         {
 813             nTimeOffset = 0;
 814             // If nobody else has the same time as us, give a warning
 815             bool fMatch = false;
 816             foreach(int64 nOffset, vTimeOffsets)
 817                 if (nOffset != 0 && abs64(nOffset) < 5 * 60)
 818                     fMatch = true;
 819             static bool fDone;
 820             if (!fMatch && !fDone)
 821             {
 822                 fDone = true;
 823                 string strMessage = _("Warning: Please check that your computer's date and time are correct.  If your clock is wrong Bitcoin will not work properly.");
 824                 strMiscWarning = strMessage;
 825                 printf("*** %s\n", strMessage.c_str());
 826                 boost::thread(boost::bind(ThreadSafeMessageBox, strMessage+" ", string("Bitcoin"), wxOK | wxICON_EXCLAMATION, (wxWindow*)NULL, -1, -1));
 827             }
 828         }
 829         foreach(int64 n, vTimeOffsets)
 830             printf("%+"PRI64d"  ", n);
 831         printf("|  nTimeOffset = %+"PRI64d"  (%+"PRI64d" minutes)\n", nTimeOffset, nTimeOffset/60);
 832     }
 833 }