Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 496 insertions, 0 deletions

diff --git a/toolkit/components/url-classifier/VariableLengthPrefixSet.cpp b/toolkit/components/url-classifier/VariableLengthPrefixSet.cpp
new file mode 100644
index 0000000000..40ea436845
--- /dev/null
+++ b/toolkit/components/url-classifier/VariableLengthPrefixSet.cpp
@@ -0,0 +1,496 @@
+/* -*- 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/. */
+
+#include "VariableLengthPrefixSet.h"
+#include "nsIInputStream.h"
+#include "nsUrlClassifierPrefixSet.h"
+#include "nsPrintfCString.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/Logging.h"
+#include "mozilla/UniquePtr.h"
+#include <algorithm>
+
+// MOZ_LOG=UrlClassifierPrefixSet:5
+static mozilla::LazyLogModule gUrlClassifierPrefixSetLog(
+    "UrlClassifierPrefixSet");
+#define LOG(args) \
+  MOZ_LOG(gUrlClassifierPrefixSetLog, mozilla::LogLevel::Debug, args)
+#define LOG_ENABLED() \
+  MOZ_LOG_TEST(gUrlClassifierPrefixSetLog, mozilla::LogLevel::Debug)
+
+namespace mozilla::safebrowsing {
+
+#define PREFIX_SIZE_FIXED 4
+
+#ifdef DEBUG
+namespace {
+
+template <class T>
+void EnsureSorted(T* aArray) {
+  MOZ_ASSERT(std::is_sorted(aArray->Elements(),
+                            aArray->Elements() + aArray->Length()));
+}
+
+}  // namespace
+#endif
+
+NS_IMPL_ISUPPORTS(VariableLengthPrefixSet, nsIMemoryReporter)
+
+// This class will process prefix size between 4~32. But for 4 bytes prefixes,
+// they will be passed to nsUrlClassifierPrefixSet because of better
+// optimization.
+VariableLengthPrefixSet::VariableLengthPrefixSet()
+    : mLock("VariableLengthPrefixSet.mLock"),
+      mFixedPrefixSet(new nsUrlClassifierPrefixSet) {}
+
+nsresult VariableLengthPrefixSet::Init(const nsACString& aName) {
+  mName = aName;
+  mMemoryReportPath = nsPrintfCString(
+      "explicit/storage/prefix-set/%s",
+      (!aName.IsEmpty() ? PromiseFlatCString(aName).get() : "?!"));
+
+  RegisterWeakMemoryReporter(this);
+
+  return mFixedPrefixSet->Init(aName);
+}
+
+VariableLengthPrefixSet::~VariableLengthPrefixSet() {
+  UnregisterWeakMemoryReporter(this);
+}
+
+nsresult VariableLengthPrefixSet::SetPrefixes(AddPrefixArray& aAddPrefixes,
+                                              AddCompleteArray& aAddCompletes) {
+  MutexAutoLock lock(mLock);
+
+  // We may modify the prefix string in this function, clear this data
+  // before returning to ensure no one use the data after this API.
+  auto scopeExit = MakeScopeExit([&]() {
+    aAddPrefixes.Clear();
+    aAddCompletes.Clear();
+  });
+
+  // Clear old prefixSet before setting new one.
+  mFixedPrefixSet->SetPrefixes(nullptr, 0);
+  mVLPrefixSet.Clear();
+
+  // Build fixed-length prefix set
+  nsTArray<uint32_t> array;
+  if (!array.SetCapacity(aAddPrefixes.Length(), fallible)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  for (size_t i = 0; i < aAddPrefixes.Length(); i++) {
+    array.AppendElement(aAddPrefixes[i].PrefixHash().ToUint32());
+  }
+
+#ifdef DEBUG
+  // PrefixSet requires sorted order
+  EnsureSorted(&array);
+#endif
+
+  nsresult rv = mFixedPrefixSet->SetPrefixes(array.Elements(), array.Length());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#ifdef DEBUG
+  uint32_t size;
+  size = mFixedPrefixSet->SizeOfIncludingThis(moz_malloc_size_of);
+  LOG(("SB tree done, size = %d bytes\n", size));
+#endif
+
+  CompletionArray completions;
+  for (size_t i = 0; i < aAddCompletes.Length(); i++) {
+    completions.AppendElement(aAddCompletes[i].CompleteHash());
+  }
+  completions.Sort();
+
+  UniquePtr<nsCString> completionStr(new nsCString);
+  completionStr->SetCapacity(completions.Length() * COMPLETE_SIZE);
+  for (size_t i = 0; i < completions.Length(); i++) {
+    const char* buf = reinterpret_cast<const char*>(completions[i].buf);
+    completionStr->Append(buf, COMPLETE_SIZE);
+  }
+  mVLPrefixSet.InsertOrUpdate(COMPLETE_SIZE, std::move(completionStr));
+
+  return NS_OK;
+}
+
+nsresult VariableLengthPrefixSet::SetPrefixes(PrefixStringMap& aPrefixMap) {
+  MutexAutoLock lock(mLock);
+
+  // We may modify the prefix string in this function, clear this data
+  // before returning to ensure no one use the data after this API.
+  auto scopeExit = MakeScopeExit([&]() { aPrefixMap.Clear(); });
+
+  // Prefix size should not less than 4-bytes or greater than 32-bytes
+  for (const auto& key : aPrefixMap.Keys()) {
+    if (key < PREFIX_SIZE_FIXED || key > COMPLETE_SIZE) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  // Clear old prefixSet before setting new one.
+  mFixedPrefixSet->SetPrefixes(nullptr, 0);
+  mVLPrefixSet.Clear();
+
+  // 4-bytes prefixes are handled by nsUrlClassifierPrefixSet.
+  nsCString* prefixes = aPrefixMap.Get(PREFIX_SIZE_FIXED);
+  if (prefixes) {
+    NS_ENSURE_TRUE(prefixes->Length() % PREFIX_SIZE_FIXED == 0,
+                   NS_ERROR_FAILURE);
+
+    uint32_t numPrefixes = prefixes->Length() / PREFIX_SIZE_FIXED;
+
+    // Prefixes are lexicographically-sorted, so the interger array
+    // passed to nsUrlClassifierPrefixSet should also follow the same order.
+    // Reverse byte order in-place in Little-Endian platform.
+#if MOZ_LITTLE_ENDIAN()
+    char* begin = prefixes->BeginWriting();
+    char* end = prefixes->EndWriting();
+
+    while (begin != end) {
+      uint32_t* p = reinterpret_cast<uint32_t*>(begin);
+      *p = BigEndian::readUint32(begin);
+      begin += sizeof(uint32_t);
+    }
+#endif
+    const uint32_t* arrayPtr =
+        reinterpret_cast<const uint32_t*>(prefixes->BeginReading());
+
+    nsresult rv = mFixedPrefixSet->SetPrefixes(arrayPtr, numPrefixes);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  // 5~32 bytes prefixes are stored in mVLPrefixSet.
+  for (const auto& entry : aPrefixMap) {
+    // Skip 4bytes prefixes because it is already stored in mFixedPrefixSet.
+    if (entry.GetKey() == PREFIX_SIZE_FIXED) {
+      continue;
+    }
+
+    mVLPrefixSet.InsertOrUpdate(entry.GetKey(),
+                                MakeUnique<nsCString>(*entry.GetData()));
+  }
+
+  return NS_OK;
+}
+
+nsresult VariableLengthPrefixSet::GetPrefixes(PrefixStringMap& aPrefixMap) {
+  MutexAutoLock lock(mLock);
+
+  // 4-bytes prefixes are handled by nsUrlClassifierPrefixSet.
+  FallibleTArray<uint32_t> array;
+  nsresult rv = mFixedPrefixSet->GetPrefixesNative(array);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  size_t count = array.Length();
+  if (count) {
+    UniquePtr<nsCString> prefixes(new nsCString());
+    if (!prefixes->SetLength(PREFIX_SIZE_FIXED * count, fallible)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    // Writing integer array to character array
+    uint32_t* begin = reinterpret_cast<uint32_t*>(prefixes->BeginWriting());
+    for (uint32_t i = 0; i < count; i++) {
+      begin[i] = NativeEndian::swapToBigEndian(array[i]);
+    }
+
+    aPrefixMap.InsertOrUpdate(PREFIX_SIZE_FIXED, std::move(prefixes));
+  }
+
+  // Copy variable-length prefix set
+  for (const auto& entry : mVLPrefixSet) {
+    aPrefixMap.InsertOrUpdate(entry.GetKey(),
+                              MakeUnique<nsCString>(*entry.GetData()));
+  }
+
+  return NS_OK;
+}
+
+// This is used by V2 protocol which prefixes are either 4-bytes or 32-bytes.
+nsresult VariableLengthPrefixSet::GetFixedLengthPrefixes(
+    FallibleTArray<uint32_t>* aPrefixes,
+    FallibleTArray<nsCString>* aCompletes) {
+  MOZ_ASSERT(aPrefixes || aCompletes);
+  MOZ_ASSERT_IF(aPrefixes, aPrefixes->IsEmpty());
+  MOZ_ASSERT_IF(aCompletes, aCompletes->IsEmpty());
+
+  if (aPrefixes) {
+    nsresult rv = mFixedPrefixSet->GetPrefixesNative(*aPrefixes);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  if (aCompletes) {
+    nsCString* completes = mVLPrefixSet.Get(COMPLETE_SIZE);
+    if (completes) {
+      uint32_t count = completes->Length() / COMPLETE_SIZE;
+      if (!aCompletes->SetCapacity(count, fallible)) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+
+      for (uint32_t i = 0; i < count; i++) {
+        // SetCapacity was just called, these cannot fail.
+        (void)aCompletes->AppendElement(
+            Substring(*completes, i * COMPLETE_SIZE, COMPLETE_SIZE), fallible);
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult VariableLengthPrefixSet::GetFixedLengthPrefixByIndex(
+    uint32_t aIndex, uint32_t* aOutPrefix) const {
+  NS_ENSURE_ARG_POINTER(aOutPrefix);
+
+  return mFixedPrefixSet->GetPrefixByIndex(aIndex, aOutPrefix);
+}
+
+// It should never be the case that more than one hash prefixes match a given
+// full hash. However, if that happens, this method returns any one of them.
+// It does not guarantee which one of those will be returned.
+nsresult VariableLengthPrefixSet::Matches(uint32_t aPrefix,
+                                          const nsACString& aFullHash,
+                                          uint32_t* aLength) const {
+  MutexAutoLock lock(mLock);
+
+  // Only allow full-length hash to check if match any of the prefix
+  MOZ_ASSERT(aFullHash.Length() == COMPLETE_SIZE);
+  NS_ENSURE_ARG_POINTER(aLength);
+
+  *aLength = 0;
+
+  // Check if it matches 4-bytes prefixSet first
+  bool found = false;
+  nsresult rv = mFixedPrefixSet->Contains(aPrefix, &found);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (found) {
+    *aLength = PREFIX_SIZE_FIXED;
+    return NS_OK;
+  }
+
+  for (const auto& entry : mVLPrefixSet) {
+    if (BinarySearch(aFullHash, *entry.GetData(), entry.GetKey())) {
+      *aLength = entry.GetKey();
+      MOZ_ASSERT(*aLength > 4);
+      return NS_OK;
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult VariableLengthPrefixSet::IsEmpty(bool* aEmpty) const {
+  MutexAutoLock lock(mLock);
+
+  NS_ENSURE_ARG_POINTER(aEmpty);
+
+  mFixedPrefixSet->IsEmpty(aEmpty);
+  *aEmpty = *aEmpty && mVLPrefixSet.IsEmpty();
+
+  return NS_OK;
+}
+
+nsresult VariableLengthPrefixSet::LoadPrefixes(nsCOMPtr<nsIInputStream>& in) {
+  MutexAutoLock lock(mLock);
+
+  // First read prefixes from fixed-length prefix set
+  nsresult rv = mFixedPrefixSet->LoadPrefixes(in);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Then read prefixes from variable-length prefix set
+  uint32_t magic;
+  uint32_t read;
+
+  rv = in->Read(reinterpret_cast<char*>(&magic), sizeof(uint32_t), &read);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(read == sizeof(uint32_t), NS_ERROR_FAILURE);
+
+  if (magic != PREFIXSET_VERSION_MAGIC) {
+    LOG(("[%s] Version magic mismatch, not loading", mName.get()));
+    return NS_ERROR_FILE_CORRUPTED;
+  }
+
+  mVLPrefixSet.Clear();
+
+  uint32_t count;
+  rv = in->Read(reinterpret_cast<char*>(&count), sizeof(uint32_t), &read);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(read == sizeof(uint32_t), NS_ERROR_FAILURE);
+
+  uint32_t totalPrefixes = 0;
+  for (; count > 0; count--) {
+    uint8_t prefixSize;
+    rv = in->Read(reinterpret_cast<char*>(&prefixSize), sizeof(uint8_t), &read);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(read == sizeof(uint8_t), NS_ERROR_FAILURE);
+
+    if (prefixSize < PREFIX_SIZE || prefixSize > COMPLETE_SIZE) {
+      return NS_ERROR_FILE_CORRUPTED;
+    }
+
+    uint32_t stringLength;
+    rv = in->Read(reinterpret_cast<char*>(&stringLength), sizeof(uint32_t),
+                  &read);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(read == sizeof(uint32_t), NS_ERROR_FAILURE);
+
+    NS_ENSURE_TRUE(stringLength % prefixSize == 0, NS_ERROR_FILE_CORRUPTED);
+    uint32_t prefixCount = stringLength / prefixSize;
+
+    UniquePtr<nsCString> vlPrefixes(new nsCString());
+    if (!vlPrefixes->SetLength(stringLength, fallible)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    rv = in->Read(reinterpret_cast<char*>(vlPrefixes->BeginWriting()),
+                  stringLength, &read);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(read == stringLength, NS_ERROR_FAILURE);
+
+    mVLPrefixSet.InsertOrUpdate(prefixSize, std::move(vlPrefixes));
+    totalPrefixes += prefixCount;
+    LOG(("[%s] Loaded %u %u-byte prefixes", mName.get(), prefixCount,
+         prefixSize));
+  }
+
+  LOG(("[%s] Loading VLPrefixSet successful (%u total prefixes)", mName.get(),
+       totalPrefixes));
+
+  return NS_OK;
+}
+
+uint32_t VariableLengthPrefixSet::CalculatePreallocateSize() const {
+  uint32_t fileSize = 0;
+
+  // Size of fixed length prefix set.
+  fileSize += mFixedPrefixSet->CalculatePreallocateSize();
+
+  // Size of variable length prefix set.
+  // Store how many prefix string.
+  fileSize += sizeof(uint32_t);
+
+  for (const auto& data : mVLPrefixSet.Values()) {
+    // Store prefix size, prefix string length, and prefix string.
+    fileSize += sizeof(uint8_t);
+    fileSize += sizeof(uint32_t);
+    fileSize += data->Length();
+  }
+  return fileSize;
+}
+
+uint32_t VariableLengthPrefixSet::FixedLengthPrefixLength() const {
+  return mFixedPrefixSet->Length();
+}
+
+nsresult VariableLengthPrefixSet::WritePrefixes(
+    nsCOMPtr<nsIOutputStream>& out) const {
+  MutexAutoLock lock(mLock);
+
+  // First, write fixed length prefix set
+  nsresult rv = mFixedPrefixSet->WritePrefixes(out);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Then, write variable length prefix set
+  uint32_t written;
+  uint32_t writelen = sizeof(uint32_t);
+  uint32_t magic = PREFIXSET_VERSION_MAGIC;
+  rv = out->Write(reinterpret_cast<char*>(&magic), writelen, &written);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(written == writelen, NS_ERROR_FAILURE);
+
+  uint32_t count = mVLPrefixSet.Count();
+  rv = out->Write(reinterpret_cast<char*>(&count), writelen, &written);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(written == writelen, NS_ERROR_FAILURE);
+
+  // Store PrefixSize, Length of Prefix String and then Prefix String
+  for (const auto& entry : mVLPrefixSet) {
+    const nsCString& vlPrefixes = *entry.GetData();
+
+    uint8_t prefixSize = entry.GetKey();
+    writelen = sizeof(uint8_t);
+    rv = out->Write(reinterpret_cast<char*>(&prefixSize), writelen, &written);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(written == writelen, NS_ERROR_FAILURE);
+
+    uint32_t stringLength = vlPrefixes.Length();
+    writelen = sizeof(uint32_t);
+    rv = out->Write(reinterpret_cast<char*>(&stringLength), writelen, &written);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(written == writelen, NS_ERROR_FAILURE);
+
+    rv = out->Write(const_cast<char*>(vlPrefixes.BeginReading()), stringLength,
+                    &written);
+    NS_ENSURE_SUCCESS(rv, rv);
+    NS_ENSURE_TRUE(stringLength == written, NS_ERROR_FAILURE);
+  }
+
+  return NS_OK;
+}
+
+bool VariableLengthPrefixSet::BinarySearch(const nsACString& aFullHash,
+                                           const nsACString& aPrefixes,
+                                           uint32_t aPrefixSize) const {
+  const char* fullhash = aFullHash.BeginReading();
+  const char* prefixes = aPrefixes.BeginReading();
+  int32_t begin = 0, end = aPrefixes.Length() / aPrefixSize;
+
+  while (end > begin) {
+    int32_t mid = (begin + end) >> 1;
+    int cmp = memcmp(fullhash, prefixes + mid * aPrefixSize, aPrefixSize);
+    if (cmp < 0) {
+      end = mid;
+    } else if (cmp > 0) {
+      begin = mid + 1;
+    } else {
+      return true;
+    }
+  }
+  return false;
+}
+
+MOZ_DEFINE_MALLOC_SIZE_OF(UrlClassifierMallocSizeOf)
+
+NS_IMETHODIMP
+VariableLengthPrefixSet::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                        nsISupports* aData, bool aAnonymize) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  size_t amount = SizeOfIncludingThis(UrlClassifierMallocSizeOf);
+
+  return aHandleReport->Callback(
+      ""_ns, mMemoryReportPath, KIND_HEAP, UNITS_BYTES, amount,
+      nsLiteralCString("Memory used by the variable-length prefix set for a "
+                       "URL classifier."),
+      aData);
+}
+
+size_t VariableLengthPrefixSet::SizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  MutexAutoLock lock(mLock);
+
+  size_t n = 0;
+  n += aMallocSizeOf(this);
+
+  n += mFixedPrefixSet->SizeOfIncludingThis(moz_malloc_size_of) -
+       aMallocSizeOf(mFixedPrefixSet);
+
+  n += mVLPrefixSet.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (const auto& data : mVLPrefixSet.Values()) {
+    n += data->SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+  }
+
+  return n;
+}
+
+}  // namespace mozilla::safebrowsing