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5f50af3b4f
This implements the transmit time suggestion in (abandoned?) draft-ietf-ntp-data-minimization. (The other suggestions were already implemented as far as I can tell.)
67 lines
2 KiB
C++
67 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Platform.h>
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#include <AK/Types.h>
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#if defined(__serenity__)
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# include <stdlib.h>
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#endif
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#if defined(__linux__)
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# include <unistd.h>
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#endif
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#if defined(__APPLE__)
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# include <sys/random.h>
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#endif
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namespace AK {
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inline void fill_with_random(void* buffer, size_t length)
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{
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#if defined(__serenity__)
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arc4random_buf(buffer, length);
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#elif defined(__linux__) or defined(__APPLE__)
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int rc = getentropy(buffer, length);
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(void)rc;
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#endif
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}
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template<typename T>
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inline T get_random()
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{
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T t;
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fill_with_random(&t, sizeof(T));
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return t;
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}
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}
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using AK::fill_with_random;
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using AK::get_random;
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