src/util.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2012 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   5 #include "headers.h"
   6 #include "strlcpy.h"
   7 #include <boost/algorithm/string/join.hpp>
   8 #include <boost/program_options/detail/config_file.hpp>
   9 #include <boost/program_options/parsers.hpp>
  10 #include <boost/filesystem.hpp>
  11 #include <boost/filesystem/fstream.hpp>
  12 #include <boost/interprocess/sync/interprocess_mutex.hpp>
  13 #include <boost/interprocess/sync/interprocess_recursive_mutex.hpp>
  14 #include <boost/foreach.hpp>
  15
  16 using namespace std;
  17 using namespace boost;
  18
  19 map<string, string> mapArgs;
  20 map<string, vector<string> > mapMultiArgs;
  21 bool fDebug = false;
  22 bool fPrintToConsole = false;
  23 bool fPrintToDebugger = false;
  24 char pszSetDataDir[MAX_PATH] = "";
  25 bool fRequestShutdown = false;
  26 bool fShutdown = false;
  27 bool fDaemon = false;
  28 bool fServer = false;
  29 bool fCommandLine = false;
  30 string strMiscWarning;
  31 bool fTestNet = false;
  32 bool fNoListen = false;
  33 bool fLogTimestamps = false;
  34 CMedianFilter<int64> vTimeOffsets(200,0);
  35
  36
  37
  38 // Workaround for "multiple definition of `_tls_used'"
  39 // http://svn.boost.org/trac/boost/ticket/4258
  40 extern "C" void tss_cleanup_implemented() { }
  41
  42
  43
  44
  45
  46 // Init openssl library multithreading support
  47 static boost::interprocess::interprocess_mutex** ppmutexOpenSSL;
  48 void locking_callback(int mode, int i, const char* file, int line)
  49 {
  50     if (mode & CRYPTO_LOCK)
  51         ppmutexOpenSSL[i]->lock();
  52     else
  53         ppmutexOpenSSL[i]->unlock();
  54 }
  55
  56 // Init
  57 class CInit
  58 {
  59 public:
  60     CInit()
  61     {
  62         // Init openssl library multithreading support
  63         ppmutexOpenSSL = (boost::interprocess::interprocess_mutex**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(boost::interprocess::interprocess_mutex*));
  64         for (int i = 0; i < CRYPTO_num_locks(); i++)
  65             ppmutexOpenSSL[i] = new boost::interprocess::interprocess_mutex();
  66         CRYPTO_set_locking_callback(locking_callback);
  67
  68 #ifdef WIN32
  69         // Seed random number generator with screen scrape and other hardware sources
  70         RAND_screen();
  71 #endif
  72
  73         // Seed random number generator with performance counter
  74         RandAddSeed();
  75     }
  76     ~CInit()
  77     {
  78         // Shutdown openssl library multithreading support
  79         CRYPTO_set_locking_callback(NULL);
  80         for (int i = 0; i < CRYPTO_num_locks(); i++)
  81             delete ppmutexOpenSSL[i];
  82         OPENSSL_free(ppmutexOpenSSL);
  83     }
  84 }
  85 instance_of_cinit;
  86
  87
  88
  89
  90
  91
  92
  93
  94 void RandAddSeed()
  95 {
  96     // Seed with CPU performance counter
  97     int64 nCounter = GetPerformanceCounter();
  98     RAND_add(&nCounter, sizeof(nCounter), 1.5);
  99     memset(&nCounter, 0, sizeof(nCounter));
 100 }
 101
 102 void RandAddSeedPerfmon()
 103 {
 104     RandAddSeed();
 105
 106     // This can take up to 2 seconds, so only do it every 10 minutes
 107     static int64 nLastPerfmon;
 108     if (GetTime() < nLastPerfmon + 10 * 60)
 109         return;
 110     nLastPerfmon = GetTime();
 111
 112 #ifdef WIN32
 113     // Don't need this on Linux, OpenSSL automatically uses /dev/urandom
 114     // Seed with the entire set of perfmon data
 115     unsigned char pdata[250000];
 116     memset(pdata, 0, sizeof(pdata));
 117     unsigned long nSize = sizeof(pdata);
 118     long ret = RegQueryValueExA(HKEY_PERFORMANCE_DATA, "Global", NULL, NULL, pdata, &nSize);
 119     RegCloseKey(HKEY_PERFORMANCE_DATA);
 120     if (ret == ERROR_SUCCESS)
 121     {
 122         RAND_add(pdata, nSize, nSize/100.0);
 123         memset(pdata, 0, nSize);
 124         printf("%s RandAddSeed() %d bytes\n", DateTimeStrFormat("%x %H:%M", GetTime()).c_str(), nSize);
 125     }
 126 #endif
 127 }
 128
 129 uint64 GetRand(uint64 nMax)
 130 {
 131     if (nMax == 0)
 132         return 0;
 133
 134     // The range of the random source must be a multiple of the modulus
 135     // to give every possible output value an equal possibility
 136     uint64 nRange = (std::numeric_limits<uint64>::max() / nMax) * nMax;
 137     uint64 nRand = 0;
 138     do
 139         RAND_bytes((unsigned char*)&nRand, sizeof(nRand));
 140     while (nRand >= nRange);
 141     return (nRand % nMax);
 142 }
 143
 144 int GetRandInt(int nMax)
 145 {
 146     return GetRand(nMax);
 147 }
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159 inline int OutputDebugStringF(const char* pszFormat, ...)
 160 {
 161     int ret = 0;
 162     if (fPrintToConsole)
 163     {
 164         // print to console
 165         va_list arg_ptr;
 166         va_start(arg_ptr, pszFormat);
 167         ret = vprintf(pszFormat, arg_ptr);
 168         va_end(arg_ptr);
 169     }
 170     else
 171     {
 172         // print to debug.log
 173         static FILE* fileout = NULL;
 174
 175         if (!fileout)
 176         {
 177             char pszFile[MAX_PATH+100];
 178             GetDataDir(pszFile);
 179             strlcat(pszFile, "/debug.log", sizeof(pszFile));
 180             fileout = fopen(pszFile, "a");
 181             if (fileout) setbuf(fileout, NULL); // unbuffered
 182         }
 183         if (fileout)
 184         {
 185             static bool fStartedNewLine = true;
 186
 187             // Debug print useful for profiling
 188             if (fLogTimestamps && fStartedNewLine)
 189                 fprintf(fileout, "%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 190             if (pszFormat[strlen(pszFormat) - 1] == '\n')
 191                 fStartedNewLine = true;
 192             else
 193                 fStartedNewLine = false;
 194
 195             va_list arg_ptr;
 196             va_start(arg_ptr, pszFormat);
 197             ret = vfprintf(fileout, pszFormat, arg_ptr);
 198             va_end(arg_ptr);
 199         }
 200     }
 201
 202 #ifdef WIN32
 203     if (fPrintToDebugger)
 204     {
 205         static CCriticalSection cs_OutputDebugStringF;
 206
 207         // accumulate a line at a time
 208         CRITICAL_BLOCK(cs_OutputDebugStringF)
 209         {
 210             static char pszBuffer[50000];
 211             static char* pend;
 212             if (pend == NULL)
 213                 pend = pszBuffer;
 214             va_list arg_ptr;
 215             va_start(arg_ptr, pszFormat);
 216             int limit = END(pszBuffer) - pend - 2;
 217             int ret = _vsnprintf(pend, limit, pszFormat, arg_ptr);
 218             va_end(arg_ptr);
 219             if (ret < 0 || ret >= limit)
 220             {
 221                 pend = END(pszBuffer) - 2;
 222                 *pend++ = '\n';
 223             }
 224             else
 225                 pend += ret;
 226             *pend = '\0';
 227             char* p1 = pszBuffer;
 228             char* p2;
 229             while (p2 = strchr(p1, '\n'))
 230             {
 231                 p2++;
 232                 char c = *p2;
 233                 *p2 = '\0';
 234                 OutputDebugStringA(p1);
 235                 *p2 = c;
 236                 p1 = p2;
 237             }
 238             if (p1 != pszBuffer)
 239                 memmove(pszBuffer, p1, pend - p1 + 1);
 240             pend -= (p1 - pszBuffer);
 241         }
 242     }
 243 #endif
 244     return ret;
 245 }
 246
 247
 248 // Safer snprintf
 249 //  - prints up to limit-1 characters
 250 //  - output string is always null terminated even if limit reached
 251 //  - return value is the number of characters actually printed
 252 int my_snprintf(char* buffer, size_t limit, const char* format, ...)
 253 {
 254     if (limit == 0)
 255         return 0;
 256     va_list arg_ptr;
 257     va_start(arg_ptr, format);
 258     int ret = _vsnprintf(buffer, limit, format, arg_ptr);
 259     va_end(arg_ptr);
 260     if (ret < 0 || ret >= limit)
 261     {
 262         ret = limit - 1;
 263         buffer[limit-1] = 0;
 264     }
 265     return ret;
 266 }
 267
 268 string strprintf(const std::string &format, ...)
 269 {
 270     char buffer[50000];
 271     char* p = buffer;
 272     int limit = sizeof(buffer);
 273     int ret;
 274     loop
 275     {
 276         va_list arg_ptr;
 277         va_start(arg_ptr, format);
 278         ret = _vsnprintf(p, limit, format.c_str(), arg_ptr);
 279         va_end(arg_ptr);
 280         if (ret >= 0 && ret < limit)
 281             break;
 282         if (p != buffer)
 283             delete[] p;
 284         limit *= 2;
 285         p = new char[limit];
 286         if (p == NULL)
 287             throw std::bad_alloc();
 288     }
 289     string str(p, p+ret);
 290     if (p != buffer)
 291         delete[] p;
 292     return str;
 293 }
 294
 295 bool error(const std::string &format, ...)
 296 {
 297     char buffer[50000];
 298     int limit = sizeof(buffer);
 299     va_list arg_ptr;
 300     va_start(arg_ptr, format);
 301     int ret = _vsnprintf(buffer, limit, format.c_str(), arg_ptr);
 302     va_end(arg_ptr);
 303     if (ret < 0 || ret >= limit)
 304     {
 305         ret = limit - 1;
 306         buffer[limit-1] = 0;
 307     }
 308     printf("ERROR: %s\n", buffer);
 309     return false;
 310 }
 311
 312
 313 void ParseString(const string& str, char c, vector<string>& v)
 314 {
 315     if (str.empty())
 316         return;
 317     string::size_type i1 = 0;
 318     string::size_type i2;
 319     loop
 320     {
 321         i2 = str.find(c, i1);
 322         if (i2 == str.npos)
 323         {
 324             v.push_back(str.substr(i1));
 325             return;
 326         }
 327         v.push_back(str.substr(i1, i2-i1));
 328         i1 = i2+1;
 329     }
 330 }
 331
 332
 333 string FormatMoney(int64 n, bool fPlus)
 334 {
 335     // Note: not using straight sprintf here because we do NOT want
 336     // localized number formatting.
 337     int64 n_abs = (n > 0 ? n : -n);
 338     int64 quotient = n_abs/COIN;
 339     int64 remainder = n_abs%COIN;
 340     string str = strprintf("%"PRI64d".%08"PRI64d, quotient, remainder);
 341
 342     // Right-trim excess 0's before the decimal point:
 343     int nTrim = 0;
 344     for (int i = str.size()-1; (str[i] == '0' && isdigit(str[i-2])); --i)
 345         ++nTrim;
 346     if (nTrim)
 347         str.erase(str.size()-nTrim, nTrim);
 348
 349     if (n < 0)
 350         str.insert((unsigned int)0, 1, '-');
 351     else if (fPlus && n > 0)
 352         str.insert((unsigned int)0, 1, '+');
 353     return str;
 354 }
 355
 356
 357 bool ParseMoney(const string& str, int64& nRet)
 358 {
 359     return ParseMoney(str.c_str(), nRet);
 360 }
 361
 362 bool ParseMoney(const char* pszIn, int64& nRet)
 363 {
 364     string strWhole;
 365     int64 nUnits = 0;
 366     const char* p = pszIn;
 367     while (isspace(*p))
 368         p++;
 369     for (; *p; p++)
 370     {
 371         if (*p == '.')
 372         {
 373             p++;
 374             int64 nMult = CENT*10;
 375             while (isdigit(*p) && (nMult > 0))
 376             {
 377                 nUnits += nMult * (*p++ - '0');
 378                 nMult /= 10;
 379             }
 380             break;
 381         }
 382         if (isspace(*p))
 383             break;
 384         if (!isdigit(*p))
 385             return false;
 386         strWhole.insert(strWhole.end(), *p);
 387     }
 388     for (; *p; p++)
 389         if (!isspace(*p))
 390             return false;
 391     if (strWhole.size() > 10) // guard against 63 bit overflow
 392         return false;
 393     if (nUnits < 0 || nUnits > COIN)
 394         return false;
 395     int64 nWhole = atoi64(strWhole);
 396     int64 nValue = nWhole*COIN + nUnits;
 397
 398     nRet = nValue;
 399     return true;
 400 }
 401
 402
 403 static char phexdigit[256] =
 404 { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 405   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 406   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 407   0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,
 408   -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 409   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 410   -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1
 411   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 412   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 413   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 414   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 415   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 416   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 417   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 418   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
 419   -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
 420
 421 bool IsHex(const string& str)
 422 {
 423     BOOST_FOREACH(unsigned char c, str)
 424     {
 425         if (phexdigit[c] < 0)
 426             return false;
 427     }
 428     return (str.size() > 0) && (str.size()%2 == 0);
 429 }
 430
 431 vector<unsigned char> ParseHex(const char* psz)
 432 {
 433     // convert hex dump to vector
 434     vector<unsigned char> vch;
 435     loop
 436     {
 437         while (isspace(*psz))
 438             psz++;
 439         char c = phexdigit[(unsigned char)*psz++];
 440         if (c == (char)-1)
 441             break;
 442         unsigned char n = (c << 4);
 443         c = phexdigit[(unsigned char)*psz++];
 444         if (c == (char)-1)
 445             break;
 446         n |= c;
 447         vch.push_back(n);
 448     }
 449     return vch;
 450 }
 451
 452 vector<unsigned char> ParseHex(const string& str)
 453 {
 454     return ParseHex(str.c_str());
 455 }
 456
 457 static void InterpretNegativeSetting(string name, map<string, string>& mapSettingsRet)
 458 {
 459     // interpret -nofoo as -foo=0 (and -nofoo=0 as -foo=1) as long as -foo not set
 460     if (name.find("-no") == 0)
 461     {
 462         std::string positive("-");
 463         positive.append(name.begin()+3, name.end());
 464         if (mapSettingsRet.count(positive) == 0)
 465         {
 466             bool value = !GetBoolArg(name);
 467             mapSettingsRet[positive] = (value ? "1" : "0");
 468         }
 469     }
 470 }
 471
 472 void ParseParameters(int argc, const char*const argv[])
 473 {
 474     mapArgs.clear();
 475     mapMultiArgs.clear();
 476     for (int i = 1; i < argc; i++)
 477     {
 478         char psz[10000];
 479         strlcpy(psz, argv[i], sizeof(psz));
 480         char* pszValue = (char*)"";
 481         if (strchr(psz, '='))
 482         {
 483             pszValue = strchr(psz, '=');
 484             *pszValue++ = '\0';
 485         }
 486         #ifdef WIN32
 487         _strlwr(psz);
 488         if (psz[0] == '/')
 489             psz[0] = '-';
 490         #endif
 491         if (psz[0] != '-')
 492             break;
 493
 494         mapArgs[psz] = pszValue;
 495         mapMultiArgs[psz].push_back(pszValue);
 496     }
 497
 498     // New 0.6 features:
 499     BOOST_FOREACH(const PAIRTYPE(string,string)& entry, mapArgs)
 500     {
 501         string name = entry.first;
 502
 503         //  interpret --foo as -foo (as long as both are not set)
 504         if (name.find("--") == 0)
 505         {
 506             std::string singleDash(name.begin()+1, name.end());
 507             if (mapArgs.count(singleDash) == 0)
 508                 mapArgs[singleDash] = entry.second;
 509             name = singleDash;
 510         }
 511
 512         // interpret -nofoo as -foo=0 (and -nofoo=0 as -foo=1) as long as -foo not set
 513         InterpretNegativeSetting(name, mapArgs);
 514     }
 515 }
 516
 517 std::string GetArg(const std::string& strArg, const std::string& strDefault)
 518 {
 519     if (mapArgs.count(strArg))
 520         return mapArgs[strArg];
 521     return strDefault;
 522 }
 523
 524 int64 GetArg(const std::string& strArg, int64 nDefault)
 525 {
 526     if (mapArgs.count(strArg))
 527         return atoi64(mapArgs[strArg]);
 528     return nDefault;
 529 }
 530
 531 bool GetBoolArg(const std::string& strArg, bool fDefault)
 532 {
 533     if (mapArgs.count(strArg))
 534     {
 535         if (mapArgs[strArg].empty())
 536             return true;
 537         return (atoi(mapArgs[strArg]) != 0);
 538     }
 539     return fDefault;
 540 }
 541
 542 bool SoftSetArg(const std::string& strArg, const std::string& strValue)
 543 {
 544     if (mapArgs.count(strArg))
 545         return false;
 546     mapArgs[strArg] = strValue;
 547     return true;
 548 }
 549
 550 bool SoftSetBoolArg(const std::string& strArg, bool fValue)
 551 {
 552     if (fValue)
 553         return SoftSetArg(strArg, std::string("1"));
 554     else
 555         return SoftSetArg(strArg, std::string("0"));
 556 }
 557
 558
 559 string EncodeBase64(const unsigned char* pch, size_t len)
 560 {
 561     static const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 562
 563     string strRet="";
 564     strRet.reserve((len+2)/3*4);
 565
 566     int mode=0, left=0;
 567     const unsigned char *pchEnd = pch+len;
 568
 569     while (pch<pchEnd)
 570     {
 571         int enc = *(pch++);
 572         switch (mode)
 573         {
 574             case 0: // we have no bits
 575                 strRet += pbase64[enc >> 2];
 576                 left = (enc & 3) << 4;
 577                 mode = 1;
 578                 break;
 579
 580             case 1: // we have two bits
 581                 strRet += pbase64[left | (enc >> 4)];
 582                 left = (enc & 15) << 2;
 583                 mode = 2;
 584                 break;
 585
 586             case 2: // we have four bits
 587                 strRet += pbase64[left | (enc >> 6)];
 588                 strRet += pbase64[enc & 63];
 589                 mode = 0;
 590                 break;
 591         }
 592     }
 593
 594     if (mode)
 595     {
 596         strRet += pbase64[left];
 597         strRet += '=';
 598         if (mode == 1)
 599             strRet += '=';
 600     }
 601
 602     return strRet;
 603 }
 604
 605 string EncodeBase64(const string& str)
 606 {
 607     return EncodeBase64((const unsigned char*)str.c_str(), str.size());
 608 }
 609
 610 vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid)
 611 {
 612     static const int decode64_table[256] =
 613     {
 614         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 615         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 616         -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1,
 617         -1, -1, -1, -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
 618         15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28,
 619         29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
 620         49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 621         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 622         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 623         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 624         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 625         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 626         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
 627     };
 628
 629     if (pfInvalid)
 630         *pfInvalid = false;
 631
 632     vector<unsigned char> vchRet;
 633     vchRet.reserve(strlen(p)*3/4);
 634
 635     int mode = 0;
 636     int left = 0;
 637
 638     while (1)
 639     {
 640          int dec = decode64_table[*p];
 641          if (dec == -1) break;
 642          p++;
 643          switch (mode)
 644          {
 645              case 0: // we have no bits and get 6
 646                  left = dec;
 647                  mode = 1;
 648                  break;
 649
 650               case 1: // we have 6 bits and keep 4
 651                   vchRet.push_back((left<<2) | (dec>>4));
 652                   left = dec & 15;
 653                   mode = 2;
 654                   break;
 655
 656              case 2: // we have 4 bits and get 6, we keep 2
 657                  vchRet.push_back((left<<4) | (dec>>2));
 658                  left = dec & 3;
 659                  mode = 3;
 660                  break;
 661
 662              case 3: // we have 2 bits and get 6
 663                  vchRet.push_back((left<<6) | dec);
 664                  mode = 0;
 665                  break;
 666          }
 667     }
 668
 669     if (pfInvalid)
 670         switch (mode)
 671         {
 672             case 0: // 4n base64 characters processed: ok
 673                 break;
 674
 675             case 1: // 4n+1 base64 character processed: impossible
 676                 *pfInvalid = true;
 677                 break;
 678
 679             case 2: // 4n+2 base64 characters processed: require '=='
 680                 if (left || p[0] != '=' || p[1] != '=' || decode64_table[p[2]] != -1)
 681                     *pfInvalid = true;
 682                 break;
 683
 684             case 3: // 4n+3 base64 characters processed: require '='
 685                 if (left || p[0] != '=' || decode64_table[p[1]] != -1)
 686                     *pfInvalid = true;
 687                 break;
 688         }
 689
 690     return vchRet;
 691 }
 692
 693 string DecodeBase64(const string& str)
 694 {
 695     vector<unsigned char> vchRet = DecodeBase64(str.c_str());
 696     return string((const char*)&vchRet[0], vchRet.size());
 697 }
 698
 699
 700 bool WildcardMatch(const char* psz, const char* mask)
 701 {
 702     loop
 703     {
 704         switch (*mask)
 705         {
 706         case '\0':
 707             return (*psz == '\0');
 708         case '*':
 709             return WildcardMatch(psz, mask+1) || (*psz && WildcardMatch(psz+1, mask));
 710         case '?':
 711             if (*psz == '\0')
 712                 return false;
 713             break;
 714         default:
 715             if (*psz != *mask)
 716                 return false;
 717             break;
 718         }
 719         psz++;
 720         mask++;
 721     }
 722 }
 723
 724 bool WildcardMatch(const string& str, const string& mask)
 725 {
 726     return WildcardMatch(str.c_str(), mask.c_str());
 727 }
 728
 729
 730
 731
 732
 733
 734
 735
 736 void FormatException(char* pszMessage, std::exception* pex, const char* pszThread)
 737 {
 738 #ifdef WIN32
 739     char pszModule[MAX_PATH];
 740     pszModule[0] = '\0';
 741     GetModuleFileNameA(NULL, pszModule, sizeof(pszModule));
 742 #else
 743     const char* pszModule = "bitcoin";
 744 #endif
 745     if (pex)
 746         snprintf(pszMessage, 1000,
 747             "EXCEPTION: %s       \n%s       \n%s in %s       \n", typeid(*pex).name(), pex->what(), pszModule, pszThread);
 748     else
 749         snprintf(pszMessage, 1000,
 750             "UNKNOWN EXCEPTION       \n%s in %s       \n", pszModule, pszThread);
 751 }
 752
 753 void LogException(std::exception* pex, const char* pszThread)
 754 {
 755     char pszMessage[10000];
 756     FormatException(pszMessage, pex, pszThread);
 757     printf("\n%s", pszMessage);
 758 }
 759
 760 void PrintException(std::exception* pex, const char* pszThread)
 761 {
 762     char pszMessage[10000];
 763     FormatException(pszMessage, pex, pszThread);
 764     printf("\n\n************************\n%s\n", pszMessage);
 765     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 766     strMiscWarning = pszMessage;
 767     throw;
 768 }
 769
 770 void ThreadOneMessageBox(string strMessage)
 771 {
 772     // Skip message boxes if one is already open
 773     static bool fMessageBoxOpen;
 774     if (fMessageBoxOpen)
 775         return;
 776     fMessageBoxOpen = true;
 777     ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
 778     fMessageBoxOpen = false;
 779 }
 780
 781 void PrintExceptionContinue(std::exception* pex, const char* pszThread)
 782 {
 783     char pszMessage[10000];
 784     FormatException(pszMessage, pex, pszThread);
 785     printf("\n\n************************\n%s\n", pszMessage);
 786     fprintf(stderr, "\n\n************************\n%s\n", pszMessage);
 787     strMiscWarning = pszMessage;
 788 }
 789
 790
 791
 792
 793
 794
 795
 796
 797 #ifdef WIN32
 798 typedef WINSHELLAPI BOOL (WINAPI *PSHGETSPECIALFOLDERPATHA)(HWND hwndOwner, LPSTR lpszPath, int nFolder, BOOL fCreate);
 799
 800 string MyGetSpecialFolderPath(int nFolder, bool fCreate)
 801 {
 802     char pszPath[MAX_PATH+100] = "";
 803
 804     // SHGetSpecialFolderPath isn't always available on old Windows versions
 805     HMODULE hShell32 = LoadLibraryA("shell32.dll");
 806     if (hShell32)
 807     {
 808         PSHGETSPECIALFOLDERPATHA pSHGetSpecialFolderPath =
 809             (PSHGETSPECIALFOLDERPATHA)GetProcAddress(hShell32, "SHGetSpecialFolderPathA");
 810         if (pSHGetSpecialFolderPath)
 811             (*pSHGetSpecialFolderPath)(NULL, pszPath, nFolder, fCreate);
 812         FreeModule(hShell32);
 813     }
 814
 815     // Backup option
 816     if (pszPath[0] == '\0')
 817     {
 818         if (nFolder == CSIDL_STARTUP)
 819         {
 820             strcpy(pszPath, getenv("USERPROFILE"));
 821             strcat(pszPath, "\\Start Menu\\Programs\\Startup");
 822         }
 823         else if (nFolder == CSIDL_APPDATA)
 824         {
 825             strcpy(pszPath, getenv("APPDATA"));
 826         }
 827     }
 828
 829     return pszPath;
 830 }
 831 #endif
 832
 833 string GetDefaultDataDir()
 834 {
 835     // Windows: C:\Documents and Settings\username\Application Data\Bitcoin
 836     // Mac: ~/Library/Application Support/Bitcoin
 837     // Unix: ~/.bitcoin
 838 #ifdef WIN32
 839     // Windows
 840     return MyGetSpecialFolderPath(CSIDL_APPDATA, true) + "\\Bitcoin";
 841 #else
 842     char* pszHome = getenv("HOME");
 843     if (pszHome == NULL || strlen(pszHome) == 0)
 844         pszHome = (char*)"/";
 845     string strHome = pszHome;
 846     if (strHome[strHome.size()-1] != '/')
 847         strHome += '/';
 848 #ifdef MAC_OSX
 849     // Mac
 850     strHome += "Library/Application Support/";
 851     filesystem::create_directory(strHome.c_str());
 852     return strHome + "Bitcoin";
 853 #else
 854     // Unix
 855     return strHome + ".bitcoin";
 856 #endif
 857 #endif
 858 }
 859
 860 void GetDataDir(char* pszDir)
 861 {
 862     // pszDir must be at least MAX_PATH length.
 863     int nVariation;
 864     if (pszSetDataDir[0] != 0)
 865     {
 866         strlcpy(pszDir, pszSetDataDir, MAX_PATH);
 867         nVariation = 0;
 868     }
 869     else
 870     {
 871         // This can be called during exceptions by printf, so we cache the
 872         // value so we don't have to do memory allocations after that.
 873         static char pszCachedDir[MAX_PATH];
 874         if (pszCachedDir[0] == 0)
 875             strlcpy(pszCachedDir, GetDefaultDataDir().c_str(), sizeof(pszCachedDir));
 876         strlcpy(pszDir, pszCachedDir, MAX_PATH);
 877         nVariation = 1;
 878     }
 879     if (fTestNet)
 880     {
 881         char* p = pszDir + strlen(pszDir);
 882         if (p > pszDir && p[-1] != '/' && p[-1] != '\\')
 883             *p++ = '/';
 884         strcpy(p, "testnet");
 885         nVariation += 2;
 886     }
 887     static bool pfMkdir[4];
 888     if (!pfMkdir[nVariation])
 889     {
 890         pfMkdir[nVariation] = true;
 891         boost::filesystem::create_directory(pszDir);
 892     }
 893 }
 894
 895 string GetDataDir()
 896 {
 897     char pszDir[MAX_PATH];
 898     GetDataDir(pszDir);
 899     return pszDir;
 900 }
 901
 902 string GetConfigFile()
 903 {
 904     namespace fs = boost::filesystem;
 905     fs::path pathConfig(GetArg("-conf", "bitcoin.conf"));
 906     if (!pathConfig.is_complete())
 907         pathConfig = fs::path(GetDataDir()) / pathConfig;
 908     return pathConfig.string();
 909 }
 910
 911 void ReadConfigFile(map<string, string>& mapSettingsRet,
 912                     map<string, vector<string> >& mapMultiSettingsRet)
 913 {
 914     namespace fs = boost::filesystem;
 915     namespace pod = boost::program_options::detail;
 916
 917     fs::ifstream streamConfig(GetConfigFile());
 918     if (!streamConfig.good())
 919         return;
 920
 921     set<string> setOptions;
 922     setOptions.insert("*");
 923
 924     for (pod::config_file_iterator it(streamConfig, setOptions), end; it != end; ++it)
 925     {
 926         // Don't overwrite existing settings so command line settings override bitcoin.conf
 927         string strKey = string("-") + it->string_key;
 928         if (mapSettingsRet.count(strKey) == 0)
 929         {
 930             mapSettingsRet[strKey] = it->value[0];
 931             //  interpret nofoo=1 as foo=0 (and nofoo=0 as foo=1) as long as foo not set)
 932             InterpretNegativeSetting(strKey, mapSettingsRet);
 933         }
 934         mapMultiSettingsRet[strKey].push_back(it->value[0]);
 935     }
 936 }
 937
 938 string GetPidFile()
 939 {
 940     namespace fs = boost::filesystem;
 941     fs::path pathConfig(GetArg("-pid", "bitcoind.pid"));
 942     if (!pathConfig.is_complete())
 943         pathConfig = fs::path(GetDataDir()) / pathConfig;
 944     return pathConfig.string();
 945 }
 946
 947 void CreatePidFile(string pidFile, pid_t pid)
 948 {
 949     FILE* file = fopen(pidFile.c_str(), "w");
 950     if (file)
 951     {
 952         fprintf(file, "%d\n", pid);
 953         fclose(file);
 954     }
 955 }
 956
 957 int GetFilesize(FILE* file)
 958 {
 959     int nSavePos = ftell(file);
 960     int nFilesize = -1;
 961     if (fseek(file, 0, SEEK_END) == 0)
 962         nFilesize = ftell(file);
 963     fseek(file, nSavePos, SEEK_SET);
 964     return nFilesize;
 965 }
 966
 967 void ShrinkDebugFile()
 968 {
 969     // Scroll debug.log if it's getting too big
 970     string strFile = GetDataDir() + "/debug.log";
 971     FILE* file = fopen(strFile.c_str(), "r");
 972     if (file && GetFilesize(file) > 10 * 1000000)
 973     {
 974         // Restart the file with some of the end
 975         char pch[200000];
 976         fseek(file, -sizeof(pch), SEEK_END);
 977         int nBytes = fread(pch, 1, sizeof(pch), file);
 978         fclose(file);
 979
 980         file = fopen(strFile.c_str(), "w");
 981         if (file)
 982         {
 983             fwrite(pch, 1, nBytes, file);
 984             fclose(file);
 985         }
 986     }
 987 }
 988
 989
 990
 991
 992
 993
 994
 995
 996 //
 997 // "Never go to sea with two chronometers; take one or three."
 998 // Our three time sources are:
 999 //  - System clock
1000 //  - Median of other nodes's clocks
1001 //  - The user (asking the user to fix the system clock if the first two disagree)
1002 //
1003 static int64 nMockTime = 0;  // For unit testing
1004
1005 int64 GetTime()
1006 {
1007     if (nMockTime) return nMockTime;
1008
1009     return time(NULL);
1010 }
1011
1012 void SetMockTime(int64 nMockTimeIn)
1013 {
1014     nMockTime = nMockTimeIn;
1015 }
1016
1017 static int64 nTimeOffset = 0;
1018
1019 int64 GetAdjustedTime()
1020 {
1021     return GetTime() + nTimeOffset;
1022 }
1023
1024 void AddTimeData(const CNetAddr& ip, int64 nTime)
1025 {
1026     int64 nOffsetSample = nTime - GetTime();
1027
1028     // Ignore duplicates
1029     static set<CNetAddr> setKnown;
1030     if (!setKnown.insert(ip).second)
1031         return;
1032
1033     // Add data
1034     vTimeOffsets.input(nOffsetSample);
1035     printf("Added time data, samples %d, offset %+"PRI64d" (%+"PRI64d" minutes)\n", vTimeOffsets.size(), nOffsetSample, nOffsetSample/60);
1036     if (vTimeOffsets.size() >= 5 && vTimeOffsets.size() % 2 == 1)
1037     {
1038         int64 nMedian = vTimeOffsets.median();
1039         std::vector<int64> vSorted = vTimeOffsets.sorted();
1040         // Only let other nodes change our time by so much
1041         if (abs64(nMedian) < 70 * 60)
1042         {
1043             nTimeOffset = nMedian;
1044         }
1045         else
1046         {
1047             nTimeOffset = 0;
1048
1049             static bool fDone;
1050             if (!fDone)
1051             {
1052                 // If nobody has a time different than ours but within 5 minutes of ours, give a warning
1053                 bool fMatch = false;
1054                 BOOST_FOREACH(int64 nOffset, vSorted)
1055                     if (nOffset != 0 && abs64(nOffset) < 5 * 60)
1056                         fMatch = true;
1057
1058                 if (!fMatch)
1059                 {
1060                     fDone = true;
1061                     string strMessage = _("Warning: Please check that your computer's date and time are correct.  If your clock is wrong Bitcoin will not work properly.");
1062                     strMiscWarning = strMessage;
1063                     printf("*** %s\n", strMessage.c_str());
1064                     boost::thread(boost::bind(ThreadSafeMessageBox, strMessage+" ", string("Bitcoin"), wxOK | wxICON_EXCLAMATION, (wxWindow*)NULL, -1, -1));
1065                 }
1066             }
1067         }
1068         if (fDebug) {
1069             BOOST_FOREACH(int64 n, vSorted)
1070                 printf("%+"PRI64d"  ", n);
1071             printf("|  ");
1072         }
1073         printf("nTimeOffset = %+"PRI64d"  (%+"PRI64d" minutes)\n", nTimeOffset, nTimeOffset/60);
1074     }
1075 }
1076
1077
1078
1079
1080
1081
1082
1083
1084 string FormatVersion(int nVersion)
1085 {
1086     if (nVersion%100 == 0)
1087         return strprintf("%d.%d.%d", nVersion/1000000, (nVersion/10000)%100, (nVersion/100)%100);
1088     else
1089         return strprintf("%d.%d.%d.%d", nVersion/1000000, (nVersion/10000)%100, (nVersion/100)%100, nVersion%100);
1090 }
1091
1092 string FormatFullVersion()
1093 {
1094     string s = FormatVersion(CLIENT_VERSION);
1095     if (VERSION_IS_BETA) {
1096         s += "-";
1097         s += _("beta");
1098     }
1099     return s;
1100 }
1101
1102 // Format the subversion field according to BIP 14 spec (https://en.bitcoin.it/wiki/BIP_0014)
1103 std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments)
1104 {
1105     std::ostringstream ss;
1106     ss << "/";
1107     ss << name << ":" << FormatVersion(nClientVersion);
1108     if (!comments.empty())
1109         ss << "(" << boost::algorithm::join(comments, "; ") << ")";
1110     ss << "/";
1111     return ss.str();
1112 }
1113
1114
1115
1116 #ifdef DEBUG_LOCKORDER
1117 //
1118 // Early deadlock detection.
1119 // Problem being solved:
1120 //    Thread 1 locks  A, then B, then C
1121 //    Thread 2 locks  D, then C, then A
1122 //     --> may result in deadlock between the two threads, depending on when they run.
1123 // Solution implemented here:
1124 // Keep track of pairs of locks: (A before B), (A before C), etc.
1125 // Complain if any thread trys to lock in a different order.
1126 //
1127
1128 struct CLockLocation
1129 {
1130     CLockLocation(const char* pszName, const char* pszFile, int nLine)
1131     {
1132         mutexName = pszName;
1133         sourceFile = pszFile;
1134         sourceLine = nLine;
1135     }
1136
1137     std::string ToString() const
1138     {
1139         return mutexName+"  "+sourceFile+":"+itostr(sourceLine);
1140     }
1141
1142 private:
1143     std::string mutexName;
1144     std::string sourceFile;
1145     int sourceLine;
1146 };
1147
1148 typedef std::vector< std::pair<CCriticalSection*, CLockLocation> > LockStack;
1149
1150 static boost::interprocess::interprocess_mutex dd_mutex;
1151 static std::map<std::pair<CCriticalSection*, CCriticalSection*>, LockStack> lockorders;
1152 static boost::thread_specific_ptr<LockStack> lockstack;
1153
1154
1155 static void potential_deadlock_detected(const std::pair<CCriticalSection*, CCriticalSection*>& mismatch, const LockStack& s1, const LockStack& s2)
1156 {
1157     printf("POTENTIAL DEADLOCK DETECTED\n");
1158     printf("Previous lock order was:\n");
1159     BOOST_FOREACH(const PAIRTYPE(CCriticalSection*, CLockLocation)& i, s2)
1160     {
1161         if (i.first == mismatch.first) printf(" (1)");
1162         if (i.first == mismatch.second) printf(" (2)");
1163         printf(" %s\n", i.second.ToString().c_str());
1164     }
1165     printf("Current lock order is:\n");
1166     BOOST_FOREACH(const PAIRTYPE(CCriticalSection*, CLockLocation)& i, s1)
1167     {
1168         if (i.first == mismatch.first) printf(" (1)");
1169         if (i.first == mismatch.second) printf(" (2)");
1170         printf(" %s\n", i.second.ToString().c_str());
1171     }
1172 }
1173
1174 static void push_lock(CCriticalSection* c, const CLockLocation& locklocation)
1175 {
1176     bool fOrderOK = true;
1177     if (lockstack.get() == NULL)
1178         lockstack.reset(new LockStack);
1179
1180     if (fDebug) printf("Locking: %s\n", locklocation.ToString().c_str());
1181     dd_mutex.lock();
1182
1183     (*lockstack).push_back(std::make_pair(c, locklocation));
1184
1185     BOOST_FOREACH(const PAIRTYPE(CCriticalSection*, CLockLocation)& i, (*lockstack))
1186     {
1187         if (i.first == c) break;
1188
1189         std::pair<CCriticalSection*, CCriticalSection*> p1 = std::make_pair(i.first, c);
1190         if (lockorders.count(p1))
1191             continue;
1192         lockorders[p1] = (*lockstack);
1193
1194         std::pair<CCriticalSection*, CCriticalSection*> p2 = std::make_pair(c, i.first);
1195         if (lockorders.count(p2))
1196         {
1197             potential_deadlock_detected(p1, lockorders[p2], lockorders[p1]);
1198             break;
1199         }
1200     }
1201     dd_mutex.unlock();
1202 }
1203
1204 static void pop_lock()
1205 {
1206     if (fDebug)
1207     {
1208         const CLockLocation& locklocation = (*lockstack).rbegin()->second;
1209         printf("Unlocked: %s\n", locklocation.ToString().c_str());
1210     }
1211     dd_mutex.lock();
1212     (*lockstack).pop_back();
1213     dd_mutex.unlock();
1214 }
1215
1216 void CCriticalSection::Enter(const char* pszName, const char* pszFile, int nLine)
1217 {
1218     push_lock(this, CLockLocation(pszName, pszFile, nLine));
1219 #ifdef DEBUG_LOCKCONTENTION
1220     bool result = mutex.try_lock();
1221     if (!result)
1222     {
1223         printf("LOCKCONTENTION: %s\n", pszName);
1224         printf("Locker: %s:%d\n", pszFile, nLine);
1225         mutex.lock();
1226         printf("Locked\n");
1227     }
1228 #else
1229     mutex.lock();
1230 #endif
1231 }
1232 void CCriticalSection::Leave()
1233 {
1234     mutex.unlock();
1235     pop_lock();
1236 }
1237 bool CCriticalSection::TryEnter(const char* pszName, const char* pszFile, int nLine)
1238 {
1239     push_lock(this, CLockLocation(pszName, pszFile, nLine));
1240     bool result = mutex.try_lock();
1241     if (!result) pop_lock();
1242     return result;
1243 }
1244
1245 #else
1246
1247 void CCriticalSection::Enter(const char* pszName, const char* pszFile, int nLine)
1248 {
1249 #ifdef DEBUG_LOCKCONTENTION
1250     bool result = mutex.try_lock();
1251     if (!result)
1252     {
1253         printf("LOCKCONTENTION: %s\n", pszName);
1254         printf("Locker: %s:%d\n", pszFile, nLine);
1255         mutex.lock();
1256     }
1257 #else
1258     mutex.lock();
1259 #endif
1260 }
1261
1262 void CCriticalSection::Leave()
1263 {
1264     mutex.unlock();
1265 }
1266
1267 bool CCriticalSection::TryEnter(const char*, const char*, int)
1268 {
1269     bool result = mutex.try_lock();
1270     return result;
1271 }
1272
1273 #endif /* DEBUG_LOCKORDER */
1274