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