mirror of
https://github.com/qbittorrent/qBittorrent.git
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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Bittorrent Client using Qt and libtorrent.
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* Copyright (C) 2024 Mike Tzou (Chocobo1)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* In addition, as a special exception, the copyright holders give permission to
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* link this program with the OpenSSL project's "OpenSSL" library (or with
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* modified versions of it that use the same license as the "OpenSSL" library),
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* and distribute the linked executables. You must obey the GNU General Public
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* License in all respects for all of the code used other than "OpenSSL". If you
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* modify file(s), you may extend this exception to your version of the file(s),
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* but you are not obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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#include <cerrno>
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#include <cstring>
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#include <limits>
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#include <sys/random.h>
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#include <QtLogging>
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namespace
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{
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class RandomLayer
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{
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// need to satisfy UniformRandomBitGenerator requirements
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public:
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using result_type = uint32_t;
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RandomLayer()
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{
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}
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static constexpr result_type min()
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{
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return std::numeric_limits<result_type>::min();
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}
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static constexpr result_type max()
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{
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return std::numeric_limits<result_type>::max();
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}
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result_type operator()()
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{
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const int RETRY_MAX = 3;
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for (int i = 0; i < RETRY_MAX; ++i)
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{
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result_type buf = 0;
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const ssize_t result = ::getrandom(&buf, sizeof(buf), 0);
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if (result == sizeof(buf)) // success
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return buf;
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if (result < 0)
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qFatal("getrandom() error. Reason: %s. Error code: %d.", std::strerror(errno), errno);
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}
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qFatal("getrandom() failed. Reason: too many retries.");
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}
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};
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}
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