mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
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f65d76170b
git-subtree-dir: OpenVPN Adapter/Vendors/openvpn git-subtree-split: da99df69492256d7a18bbea303ae98457782a4bf
89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License Version 3
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// as published by the Free Software Foundation.
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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 in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_RANDOM_DEVURAND_H
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#define OPENVPN_RANDOM_DEVURAND_H
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#include <sys/types.h> // for open()
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#include <sys/stat.h> // for open()
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#include <fcntl.h> // for open()
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#include <unistd.h> // for read()
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#include <openvpn/common/scoped_fd.hpp>
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#include <openvpn/random/randapi.hpp>
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namespace openvpn {
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class DevURand : public RandomAPI
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{
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public:
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OPENVPN_EXCEPTION(dev_urand_error);
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typedef RCPtr<DevURand> Ptr;
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DevURand()
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: dev_urandom(::open("/dev/urandom", O_RDONLY))
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{
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if (!dev_urandom.defined())
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throw dev_urand_error("init failed");
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}
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// Random algorithm name
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virtual std::string name() const
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{
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return "DevURand";
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}
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// Return true if algorithm is crypto-strength
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virtual bool is_crypto() const
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{
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return true;
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}
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// Fill buffer with random bytes
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virtual void rand_bytes(unsigned char *buf, size_t size)
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{
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if (!rndbytes(buf, size))
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throw dev_urand_error("rand_bytes failed");
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}
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// Like rand_bytes, but don't throw exception.
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// Return true on successs, false on fail.
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virtual bool rand_bytes_noexcept(unsigned char *buf, size_t size)
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{
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return rndbytes(buf, size);
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}
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private:
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bool rndbytes(unsigned char *buf, size_t size)
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{
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const ssize_t actual = ::read(dev_urandom(), buf, size);
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return size == actual;
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}
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ScopedFD dev_urandom;
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};
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}
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#endif
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