383 lines
9.5 KiB
C++
383 lines
9.5 KiB
C++
// Copyright (c) 2009 Satoshi Nakamoto
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#include "headers.h"
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bool fDebug = false;
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// Init openssl library multithreading support
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static HANDLE* lock_cs;
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void win32_locking_callback(int mode, int type, const char* file, int line)
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{
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if (mode & CRYPTO_LOCK)
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WaitForSingleObject(lock_cs[type], INFINITE);
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else
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ReleaseMutex(lock_cs[type]);
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}
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// Init
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class CInit
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{
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public:
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CInit()
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{
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// Init openssl library multithreading support
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lock_cs = (HANDLE*)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(HANDLE));
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for (int i = 0; i < CRYPTO_num_locks(); i++)
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lock_cs[i] = CreateMutex(NULL,FALSE,NULL);
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CRYPTO_set_locking_callback(win32_locking_callback);
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// Seed random number generator with screen scrape and other hardware sources
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RAND_screen();
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// Seed random number generator with perfmon data
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RandAddSeed(true);
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}
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~CInit()
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{
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// Shutdown openssl library multithreading support
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CRYPTO_set_locking_callback(NULL);
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for (int i =0 ; i < CRYPTO_num_locks(); i++)
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CloseHandle(lock_cs[i]);
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OPENSSL_free(lock_cs);
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}
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}
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instance_of_cinit;
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void RandAddSeed(bool fPerfmon)
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{
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// Seed with CPU performance counter
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LARGE_INTEGER PerformanceCount;
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QueryPerformanceCounter(&PerformanceCount);
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RAND_add(&PerformanceCount, sizeof(PerformanceCount), 1.5);
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memset(&PerformanceCount, 0, sizeof(PerformanceCount));
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static int64 nLastPerfmon;
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if (fPerfmon || GetTime() > nLastPerfmon + 5 * 60)
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{
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nLastPerfmon = GetTime();
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// Seed with the entire set of perfmon data
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unsigned char pdata[250000];
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memset(pdata, 0, sizeof(pdata));
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unsigned long nSize = sizeof(pdata);
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long ret = RegQueryValueEx(HKEY_PERFORMANCE_DATA, "Global", NULL, NULL, pdata, &nSize);
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RegCloseKey(HKEY_PERFORMANCE_DATA);
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if (ret == ERROR_SUCCESS)
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{
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uint256 hash;
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SHA256(pdata, nSize, (unsigned char*)&hash);
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RAND_add(&hash, sizeof(hash), min(nSize/500.0, (double)sizeof(hash)));
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hash = 0;
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memset(pdata, 0, nSize);
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time_t nTime;
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time(&nTime);
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struct tm* ptmTime = gmtime(&nTime);
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char pszTime[200];
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strftime(pszTime, sizeof(pszTime), "%x %H:%M:%S", ptmTime);
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printf("%s RandAddSeed() %d bytes\n", pszTime, nSize);
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}
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}
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}
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// Safer snprintf
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// - prints up to limit-1 characters
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// - output string is always null terminated even if limit reached
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// - return value is the number of characters actually printed
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int my_snprintf(char* buffer, size_t limit, const char* format, ...)
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{
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if (limit == 0)
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return 0;
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va_list arg_ptr;
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va_start(arg_ptr, format);
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int ret = _vsnprintf(buffer, limit, format, arg_ptr);
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va_end(arg_ptr);
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if (ret < 0 || ret >= limit)
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{
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ret = limit - 1;
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buffer[limit-1] = 0;
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}
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return ret;
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}
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string strprintf(const char* format, ...)
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{
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char buffer[50000];
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char* p = buffer;
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int limit = sizeof(buffer);
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int ret;
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loop
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{
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va_list arg_ptr;
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va_start(arg_ptr, format);
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ret = _vsnprintf(p, limit, format, arg_ptr);
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va_end(arg_ptr);
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if (ret >= 0 && ret < limit)
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break;
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if (p != buffer)
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delete p;
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limit *= 2;
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p = new char[limit];
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if (p == NULL)
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throw std::bad_alloc();
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}
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#ifdef _MSC_VER
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// msvc optimisation
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if (p == buffer)
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return string(p, p+ret);
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#endif
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string str(p, p+ret);
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if (p != buffer)
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delete p;
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return str;
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}
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bool error(const char* format, ...)
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{
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char buffer[50000];
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int limit = sizeof(buffer);
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va_list arg_ptr;
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va_start(arg_ptr, format);
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int ret = _vsnprintf(buffer, limit, format, arg_ptr);
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va_end(arg_ptr);
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if (ret < 0 || ret >= limit)
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{
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ret = limit - 1;
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buffer[limit-1] = 0;
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}
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printf("ERROR: %s\n", buffer);
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return false;
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}
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void PrintException(std::exception* pex, const char* pszThread)
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{
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char pszModule[MAX_PATH];
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pszModule[0] = '\0';
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GetModuleFileName(NULL, pszModule, sizeof(pszModule));
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_strlwr(pszModule);
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char pszMessage[1000];
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if (pex)
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snprintf(pszMessage, sizeof(pszMessage),
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"EXCEPTION: %s \n%s \n%s in %s \n", typeid(*pex).name(), pex->what(), pszModule, pszThread);
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else
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snprintf(pszMessage, sizeof(pszMessage),
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"UNKNOWN EXCEPTION \n%s in %s \n", pszModule, pszThread);
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printf("\n\n************************\n%s", pszMessage);
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if (wxTheApp)
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wxMessageBox(pszMessage, "Error", wxOK | wxICON_ERROR);
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throw;
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//DebugBreak();
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}
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void ParseString(const string& str, char c, vector<string>& v)
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{
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unsigned int i1 = 0;
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unsigned int i2;
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do
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{
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i2 = str.find(c, i1);
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v.push_back(str.substr(i1, i2-i1));
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i1 = i2+1;
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}
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while (i2 != str.npos);
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}
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string FormatMoney(int64 n, bool fPlus)
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{
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n /= CENT;
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string str = strprintf("%I64d.%02I64d", (n > 0 ? n : -n)/100, (n > 0 ? n : -n)%100);
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for (int i = 6; i < str.size(); i += 4)
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if (isdigit(str[str.size() - i - 1]))
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str.insert(str.size() - i, 1, ',');
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if (n < 0)
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str.insert((unsigned int)0, 1, '-');
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else if (fPlus && n > 0)
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str.insert((unsigned int)0, 1, '+');
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return str;
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}
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bool ParseMoney(const char* pszIn, int64& nRet)
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{
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string strWhole;
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int64 nCents = 0;
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const char* p = pszIn;
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while (isspace(*p))
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p++;
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for (; *p; p++)
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{
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if (*p == ',' && p > pszIn && isdigit(p[-1]) && isdigit(p[1]) && isdigit(p[2]) && isdigit(p[3]) && !isdigit(p[4]))
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continue;
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if (*p == '.')
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{
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p++;
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if (isdigit(*p))
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{
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nCents = 10 * (*p++ - '0');
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if (isdigit(*p))
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nCents += (*p++ - '0');
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}
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break;
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}
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if (isspace(*p))
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break;
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if (!isdigit(*p))
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return false;
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strWhole.insert(strWhole.end(), *p);
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}
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for (; *p; p++)
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if (!isspace(*p))
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return false;
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if (strWhole.size() > 14)
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return false;
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if (nCents < 0 || nCents > 99)
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return false;
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int64 nWhole = atoi64(strWhole);
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int64 nPreValue = nWhole * 100 + nCents;
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int64 nValue = nPreValue * CENT;
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if (nValue / CENT != nPreValue)
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return false;
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if (nValue / COIN != nWhole)
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return false;
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nRet = nValue;
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return true;
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}
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bool FileExists(const char* psz)
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{
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#ifdef WIN32
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return GetFileAttributes(psz) != -1;
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#else
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return access(psz, 0) != -1;
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#endif
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}
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int GetFilesize(FILE* file)
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{
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int nSavePos = ftell(file);
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int nFilesize = -1;
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if (fseek(file, 0, SEEK_END) == 0)
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nFilesize = ftell(file);
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fseek(file, nSavePos, SEEK_SET);
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return nFilesize;
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}
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uint64 GetRand(uint64 nMax)
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{
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if (nMax == 0)
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return 0;
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// The range of the random source must be a multiple of the modulus
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// to give every possible output value an equal possibility
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uint64 nRange = (_UI64_MAX / nMax) * nMax;
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uint64 nRand = 0;
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do
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RAND_bytes((unsigned char*)&nRand, sizeof(nRand));
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while (nRand >= nRange);
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return (nRand % nMax);
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}
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//
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// "Never go to sea with two chronometers; take one or three."
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// Our three chronometers are:
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// - System clock
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// - Median of other server's clocks
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// - NTP servers
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//
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// note: NTP isn't implemented yet, so until then we just use the median
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// of other nodes clocks to correct ours.
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//
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int64 GetTime()
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{
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return time(NULL);
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}
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static int64 nTimeOffset = 0;
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int64 GetAdjustedTime()
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{
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return GetTime() + nTimeOffset;
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}
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void AddTimeData(unsigned int ip, int64 nTime)
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{
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int64 nOffsetSample = nTime - GetTime();
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// Ignore duplicates
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static set<unsigned int> setKnown;
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if (!setKnown.insert(ip).second)
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return;
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// Add data
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static vector<int64> vTimeOffsets;
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if (vTimeOffsets.empty())
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vTimeOffsets.push_back(0);
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vTimeOffsets.push_back(nOffsetSample);
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printf("Added time data, samples %d, ip %08x, offset %+I64d (%+I64d minutes)\n", vTimeOffsets.size(), ip, vTimeOffsets.back(), vTimeOffsets.back()/60);
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if (vTimeOffsets.size() >= 5 && vTimeOffsets.size() % 2 == 1)
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{
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sort(vTimeOffsets.begin(), vTimeOffsets.end());
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int64 nMedian = vTimeOffsets[vTimeOffsets.size()/2];
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nTimeOffset = nMedian;
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if ((nMedian > 0 ? nMedian : -nMedian) > 5 * 60)
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{
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// Only let other nodes change our clock so far before we
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// go to the NTP servers
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/// todo: Get time from NTP servers, then set a flag
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/// to make sure it doesn't get changed again
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}
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foreach(int64 n, vTimeOffsets)
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printf("%+I64d ", n);
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printf("| nTimeOffset = %+I64d (%+I64d minutes)\n", nTimeOffset, nTimeOffset/60);
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}
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}
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