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+ //
+ // OSSP asgui - Accounting system graphical user interface
+ // Copyright (c) 2002-2003 The OSSP Project (http://www.ossp.org/)
+ // Copyright (c) 2002-2003 Cable & Wireless Deutschland (http://www.cw.com/de/)
+ // Copyright (c) 2002-2003 Ralf S. Engelschall <rse@engelschall.com>
+ // Copyright (c) 2002-2003 Michael Schloh von Bennewitz <michael@schloh.com>
+ //
+ // This file is part of OSSP asgui, an accounting system graphical user
+ // interface which can be found at http://www.ossp.org/pkg/tool/asgui/.
+ //
+ // Permission to use, copy, modify, and distribute this software for
+ // any purpose with or without fee is hereby granted, provided that
+ // the above copyright notice and this permission notice appear in all
+ // copies.
+ //
+ // THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ // IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
+ // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ // USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ // OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ // SUCH DAMAGE.
+ //
+ // as_rand.cpp: ISO C++ implementation
+ //
+
+ #include <fcntl.h>
+ #include <cerrno>
+
+ #include "as_rand.h"
+
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>
+ #endif // HAVE_UNISTD_H
+ #ifdef HAVE_STDLIB_H
+ #include <stdlib.h>
+ #endif // HAVE_STDLIB_H
+
+ #ifdef TIME_WITH_SYS_TIME
+ #include <sys/time.h>
+ #endif // TIME_WITH_SYS_TIME
+
+
+ namespace AS {
+
+ // Constructor
+ Rand::Rand(void)
+ {
+ this->nFd = -4; // Object fresh status
+ this->openDevice(); // Open the random device
+ // if (this->nFd < 0)
+ // throw Genexcept("Could not open /dev/urandom or /dev/random.");
+ }
+
+ // Destructor
+ Rand::~Rand()
+ {
+ this->closeDevice(); // Close the random device
+ this->nFd = -4; // Return this object to its fresh status
+ }
+
+ //
+ // Rand::openDevice(void)
+ // Open the random device associated with this object
+ //
+ void Rand::openDevice(void)
+ {
+ struct timeval Time;
+
+ if (this->nFd == -4) { // -4 indicates a fresh object
+ gettimeofday(&Time, 0);
+ this->nFd = open("/dev/urandom", O_RDONLY);
+ if (this->nFd == -1)
+ this->nFd = open("/dev/random", O_RDONLY | O_NONBLOCK);
+ srand((getpid() << 16) ^ getuid() ^ Time.tv_sec ^ Time.tv_usec); // Seed
+ }
+
+ // Improve randomness by stirring in entropy
+ gettimeofday(&Time, 0);
+ for (int nIter = (Time.tv_sec ^ Time.tv_usec) & 0x1F; nIter > 0; nIter--)
+ rand();
+ }
+
+ //
+ // Rand::closeDevice(void)
+ // Close the random device associated with this object
+ //
+ void Rand::closeDevice(void)
+ {
+ if (this->nFd >= 0)
+ close(this->nFd);
+ }
+
+ //
+ // Rand::genData(void *pvBuf, int nBytes)
+ // Generate a series of random data from the system
+ // standard random devices /dev/[u|s]random
+ //
+ void Rand::genData(void *pBuf, int nBytes)
+ {
+ int nRead = 0;
+ int nLost = 0;
+ char *szOut = (char *)pBuf;
+
+ if (this->nFd >= 0) {
+ while (nBytes > 0) {
+ nRead = read(this->nFd, szOut, nBytes);
+ if ((nRead < 0) && ((errno == EINTR) || (errno == EAGAIN)))
+ continue;
+ if (nRead <= 0) {
+ if (nLost++ == 8)
+ break;
+ continue;
+ }
+ nBytes -= nRead;
+ szOut += nRead;
+ nLost = 0;
+ }
+ }
+
+ // For systems with no /dev/random, we do the next best thing
+ for (int nIter = 0; nIter< nBytes; nIter++)
+ *szOut++ = rand() & 0xFF;
+ }
+ } // namespace AS
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