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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /xpcom/base/nsUUIDGenerator.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'xpcom/base/nsUUIDGenerator.cpp')
-rw-r--r--xpcom/base/nsUUIDGenerator.cpp177
1 files changed, 177 insertions, 0 deletions
diff --git a/xpcom/base/nsUUIDGenerator.cpp b/xpcom/base/nsUUIDGenerator.cpp
new file mode 100644
index 000000000..254a01322
--- /dev/null
+++ b/xpcom/base/nsUUIDGenerator.cpp
@@ -0,0 +1,177 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if defined(XP_WIN)
+#include <windows.h>
+#include <objbase.h>
+#elif defined(XP_MACOSX)
+#include <CoreFoundation/CoreFoundation.h>
+#else
+#include <stdlib.h>
+#include "prrng.h"
+#endif
+
+#include "nsUUIDGenerator.h"
+
+#ifdef ANDROID
+extern "C" NS_EXPORT void arc4random_buf(void*, size_t);
+#endif
+
+using namespace mozilla;
+
+NS_IMPL_ISUPPORTS(nsUUIDGenerator, nsIUUIDGenerator)
+
+nsUUIDGenerator::nsUUIDGenerator()
+ : mLock("nsUUIDGenerator.mLock")
+{
+}
+
+nsUUIDGenerator::~nsUUIDGenerator()
+{
+}
+
+nsresult
+nsUUIDGenerator::Init()
+{
+ // We're a service, so we're guaranteed that Init() is not going
+ // to be reentered while we're inside Init().
+
+#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(HAVE_ARC4RANDOM)
+ /* initialize random number generator using NSPR random noise */
+ unsigned int seed;
+
+ size_t bytes = 0;
+ while (bytes < sizeof(seed)) {
+ size_t nbytes = PR_GetRandomNoise(((unsigned char*)&seed) + bytes,
+ sizeof(seed) - bytes);
+ if (nbytes == 0) {
+ return NS_ERROR_FAILURE;
+ }
+ bytes += nbytes;
+ }
+
+ /* Initialize a new RNG state, and immediately switch
+ * back to the previous one -- we want to use mState
+ * only for our own calls to random().
+ */
+ mSavedState = initstate(seed, mState, sizeof(mState));
+ setstate(mSavedState);
+
+ mRBytes = 4;
+#ifdef RAND_MAX
+ if ((unsigned long)RAND_MAX < 0xffffffffUL) {
+ mRBytes = 3;
+ }
+ if ((unsigned long)RAND_MAX < 0x00ffffffUL) {
+ mRBytes = 2;
+ }
+ if ((unsigned long)RAND_MAX < 0x0000ffffUL) {
+ mRBytes = 1;
+ }
+ if ((unsigned long)RAND_MAX < 0x000000ffUL) {
+ return NS_ERROR_FAILURE;
+ }
+#endif
+
+#endif /* non XP_WIN and non XP_MACOSX and non ARC4RANDOM */
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsUUIDGenerator::GenerateUUID(nsID** aRet)
+{
+ nsID* id = static_cast<nsID*>(moz_xmalloc(sizeof(nsID)));
+ if (!id) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ nsresult rv = GenerateUUIDInPlace(id);
+ if (NS_FAILED(rv)) {
+ free(id);
+ return rv;
+ }
+
+ *aRet = id;
+ return rv;
+}
+
+NS_IMETHODIMP
+nsUUIDGenerator::GenerateUUIDInPlace(nsID* aId)
+{
+ // The various code in this method is probably not threadsafe, so lock
+ // across the whole method.
+ MutexAutoLock lock(mLock);
+
+#if defined(XP_WIN)
+ HRESULT hr = CoCreateGuid((GUID*)aId);
+ if (FAILED(hr)) {
+ return NS_ERROR_FAILURE;
+ }
+#elif defined(XP_MACOSX)
+ CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);
+ if (!uuid) {
+ return NS_ERROR_FAILURE;
+ }
+
+ CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuid);
+ memcpy(aId, &bytes, sizeof(nsID));
+
+ CFRelease(uuid);
+#else /* not windows or OS X; generate randomness using random(). */
+ /* XXX we should be saving the return of setstate here and switching
+ * back to it; instead, we use the value returned when we called
+ * initstate, since older glibc's have broken setstate() return values
+ */
+#ifndef HAVE_ARC4RANDOM
+ setstate(mState);
+#endif
+
+#ifdef HAVE_ARC4RANDOM_BUF
+ arc4random_buf(aId, sizeof(nsID));
+#else /* HAVE_ARC4RANDOM_BUF */
+ size_t bytesLeft = sizeof(nsID);
+ while (bytesLeft > 0) {
+#ifdef HAVE_ARC4RANDOM
+ long rval = arc4random();
+ const size_t mRBytes = 4;
+#else
+ long rval = random();
+#endif
+
+
+ uint8_t* src = (uint8_t*)&rval;
+ // We want to grab the mRBytes least significant bytes of rval, since
+ // mRBytes less than sizeof(rval) means the high bytes are 0.
+#ifdef IS_BIG_ENDIAN
+ src += sizeof(rval) - mRBytes;
+#endif
+ uint8_t* dst = ((uint8_t*)aId) + (sizeof(nsID) - bytesLeft);
+ size_t toWrite = (bytesLeft < mRBytes ? bytesLeft : mRBytes);
+ for (size_t i = 0; i < toWrite; i++) {
+ dst[i] = src[i];
+ }
+
+ bytesLeft -= toWrite;
+ }
+#endif /* HAVE_ARC4RANDOM_BUF */
+
+ /* Put in the version */
+ aId->m2 &= 0x0fff;
+ aId->m2 |= 0x4000;
+
+ /* Put in the variant */
+ aId->m3[0] &= 0x3f;
+ aId->m3[0] |= 0x80;
+
+#ifndef HAVE_ARC4RANDOM
+ /* Restore the previous RNG state */
+ setstate(mSavedState);
+#endif
+#endif
+
+ return NS_OK;
+}