mirror of
https://github.com/kasmtech/KasmVNC.git
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131 lines
3.2 KiB
C++
131 lines
3.2 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <rdr/RandomStream.h>
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#include <rdr/Exception.h>
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#include <time.h>
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#include <stdlib.h>
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#ifndef WIN32
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#include <unistd.h>
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#include <errno.h>
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#else
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#define getpid() GetCurrentProcessId()
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#ifndef RFB_HAVE_WINCRYPT
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#pragma message(" NOTE: Not building WinCrypt-based RandomStream")
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#endif
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#endif
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using namespace rdr;
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const int DEFAULT_BUF_LEN = 256;
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unsigned int RandomStream::seed;
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RandomStream::RandomStream()
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: offset(0)
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{
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ptr = end = start = new U8[DEFAULT_BUF_LEN];
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#ifdef RFB_HAVE_WINCRYPT
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provider = 0;
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if (!CryptAcquireContext(&provider, 0, 0, PROV_RSA_FULL, 0)) {
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if (GetLastError() == (DWORD)NTE_BAD_KEYSET) {
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if (!CryptAcquireContext(&provider, 0, 0, PROV_RSA_FULL, CRYPT_NEWKEYSET)) {
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fprintf(stderr, "RandomStream: unable to create keyset\n");
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provider = 0;
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}
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} else {
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fprintf(stderr, "RandomStream: unable to acquire context\n");
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provider = 0;
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}
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}
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if (!provider) {
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#else
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#ifndef WIN32
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fp = fopen("/dev/urandom", "r");
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if (!fp)
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fp = fopen("/dev/random", "r");
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if (!fp) {
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#else
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{
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#endif
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#endif
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fprintf(stderr,"RandomStream: warning: no OS supplied random source - using rand()\n");
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seed += (unsigned int) time(0) + getpid() + getpid() * 987654 + rand();
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srand(seed);
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}
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}
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RandomStream::~RandomStream() {
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delete [] start;
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#ifdef RFB_HAVE_WINCRYPT
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if (provider)
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CryptReleaseContext(provider, 0);
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#endif
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#ifndef WIN32
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if (fp) fclose(fp);
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#endif
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}
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int RandomStream::pos() {
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return offset + ptr - start;
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}
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int RandomStream::overrun(int itemSize, int nItems, bool wait) {
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if (itemSize > DEFAULT_BUF_LEN)
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throw Exception("RandomStream overrun: max itemSize exceeded");
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if (end - ptr != 0)
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memmove(start, ptr, end - ptr);
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end -= ptr - start;
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offset += ptr - start;
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ptr = start;
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int length = start + DEFAULT_BUF_LEN - end;
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#ifdef RFB_HAVE_WINCRYPT
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if (provider) {
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if (!CryptGenRandom(provider, length, (U8*)end))
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throw rdr::SystemException("unable to CryptGenRandom", GetLastError());
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end += length;
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} else {
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#else
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#ifndef WIN32
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if (fp) {
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int n = fread((U8*)end, length, 1, fp);
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if (n != 1)
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throw rdr::SystemException("reading /dev/urandom or /dev/random failed",
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errno);
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end += length;
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} else {
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#else
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{
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#endif
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#endif
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for (int i=0; i<length; i++)
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*(U8*)end++ = (int) (256.0*rand()/(RAND_MAX+1.0));
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}
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if (itemSize * nItems > end - ptr)
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nItems = (end - ptr) / itemSize;
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return nItems;
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}
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