35 lines
715 B
C++
35 lines
715 B
C++
/*
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* Copyright (C) 2015 Cloudius Systems, Ltd.
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*/
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#include "UUID.hh"
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#include "net/byteorder.hh"
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#include <random>
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#include <boost/iterator/function_input_iterator.hpp>
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namespace utils {
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UUID
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make_random_uuid() {
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// FIXME: keep in userspace
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static thread_local std::random_device urandom;
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static thread_local std::uniform_int_distribution<uint8_t> dist(0, 255);
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union {
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uint8_t b[16];
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struct {
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uint64_t msb, lsb;
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} w;
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} v;
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for (auto& b : v.b) {
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b = dist(urandom);
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}
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v.b[6] &= 0x0f;
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v.b[6] |= 0x40; // version 4
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v.b[8] &= 0x3f;
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v.b[8] |= 0x80; // IETF variant
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return UUID(net::hton(v.w.msb), net::hton(v.w.lsb));
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}
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}
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