115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. 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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (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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#include "config.h"
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#include <wtf/UUID.h>
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#include <mutex>
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#include <wtf/ASCIICType.h>
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#include <wtf/CryptographicallyRandomNumber.h>
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#include <wtf/HexNumber.h>
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#if OS(DARWIN)
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#include <sys/sysctl.h>
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#endif
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namespace WTF {
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String createCanonicalUUIDString()
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{
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unsigned randomData[4];
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cryptographicallyRandomValues(reinterpret_cast<unsigned char*>(randomData), sizeof(randomData));
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// Format as Version 4 UUID.
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return makeString(
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hex(randomData[0], 8, Lowercase),
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'-',
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hex(randomData[1] >> 16, 4, Lowercase),
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"-4",
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hex(randomData[1] & 0x00000fff, 3, Lowercase),
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'-',
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hex((randomData[2] >> 30) | 0x8, 1, Lowercase),
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hex((randomData[2] >> 16) & 0x00000fff, 3, Lowercase),
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'-',
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hex(randomData[2] & 0x0000ffff, 4, Lowercase),
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hex(randomData[3], 8, Lowercase)
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);
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}
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String bootSessionUUIDString()
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{
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#if OS(DARWIN)
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static LazyNeverDestroyed<String> bootSessionUUID;
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static std::once_flag onceKey;
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std::call_once(onceKey, [] {
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constexpr size_t maxUUIDLength = 37;
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char uuid[maxUUIDLength];
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size_t uuidLength = maxUUIDLength;
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if (sysctlbyname("kern.bootsessionuuid", uuid, &uuidLength, nullptr, 0))
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return;
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bootSessionUUID.construct(static_cast<const char*>(uuid), uuidLength - 1);
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});
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return bootSessionUUID;
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#else
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return String();
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#endif
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}
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bool isVersion4UUID(StringView value)
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{
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// Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx with hexadecimal digits for x and one of 8, 9, A, or B for y.
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if (value.length() != 36)
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return false;
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for (auto cptr = 0; cptr < 36; ++cptr) {
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if (cptr == 8 || cptr == 13 || cptr == 18 || cptr == 23) {
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if (value[cptr] != '-')
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return false;
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continue;
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}
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if (cptr == 14) {
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if (value[cptr] != '4')
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return false;
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continue;
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}
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if (cptr == 19) {
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auto y = value[cptr];
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if (y != '8' && y != '9' && y != 'a' && y != 'A' && y != 'b' && y != 'B')
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return false;
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continue;
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}
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if (!isASCIIHexDigit(value[cptr]))
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return false;
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}
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return true;
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}
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} // namespace WTF
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