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/* -*- 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 https://mozilla.org/MPL/2.0/. */
#include "mozilla/DynamicBlocklist.h"
#include "mozilla/LauncherRegistryInfo.h"
#include "nsISafeOutputStream.h"
#include "nsNetUtil.h"
namespace mozilla {
#if ENABLE_TESTS
nsDependentString testEntryString(DynamicBlockList::kTestDll,
DynamicBlockList::kTestDllBytes /
sizeof(DynamicBlockList::kTestDll[0]));
#endif
bool ShouldWriteEntry(const nsAString& name) {
#if ENABLE_TESTS
return name != testEntryString;
#else
return true;
#endif
}
DynamicBlocklistWriter::DynamicBlocklistWriter(
RefPtr<dom::Promise> aPromise,
const nsTHashSet<nsStringCaseInsensitiveHashKey>& aBlocklist)
: mPromise(aPromise), mArraySize(0), mStringBufferSize(0) {
CheckedUint32 payloadSize;
bool hasTestEntry = false;
for (const nsAString& name : aBlocklist) {
if (ShouldWriteEntry(name)) {
payloadSize += name.Length() * sizeof(char16_t);
if (!payloadSize.isValid()) {
return;
}
} else {
hasTestEntry = true;
}
}
uint32_t entriesToWrite = aBlocklist.Count();
if (hasTestEntry) {
entriesToWrite -= 1;
}
mStringBufferSize = payloadSize.value();
mArraySize = (entriesToWrite + 1) * sizeof(DllBlockInfo);
payloadSize += mArraySize;
if (!payloadSize.isValid()) {
return;
}
mStringBuffer = MakeUnique<uint8_t[]>(mStringBufferSize);
Unused << mArray.resize(entriesToWrite + 1); // aBlockEntries + sentinel
size_t currentStringOffset = 0;
size_t i = 0;
for (const nsAString& name : aBlocklist) {
if (!ShouldWriteEntry(name)) {
continue;
}
const uint32_t nameSize = name.Length() * sizeof(char16_t);
mArray[i].mMaxVersion = DllBlockInfo::ALL_VERSIONS;
mArray[i].mFlags = DllBlockInfoFlags::FLAGS_DEFAULT;
// Copy the module's name to the string buffer and store its offset
// in mName.Buffer
memcpy(mStringBuffer.get() + currentStringOffset, name.BeginReading(),
nameSize);
mArray[i].mName.Buffer =
reinterpret_cast<wchar_t*>(mArraySize + currentStringOffset);
// Only keep mName.Length and leave mName.MaximumLength to be zero
mArray[i].mName.Length = nameSize;
currentStringOffset += nameSize;
++i;
}
}
nsresult DynamicBlocklistWriter::WriteToFile(const nsAString& aName) const {
nsCOMPtr<nsIFile> file;
MOZ_TRY(NS_NewLocalFile(aName, true, getter_AddRefs(file)));
nsCOMPtr<nsIOutputStream> stream;
MOZ_TRY(NS_NewSafeLocalFileOutputStream(getter_AddRefs(stream), file));
MOZ_TRY(WriteValue(stream, kSignature));
MOZ_TRY(WriteValue(stream, kCurrentVersion));
MOZ_TRY(WriteValue(stream,
static_cast<uint32_t>(mArraySize + mStringBufferSize)));
MOZ_TRY(WriteBuffer(stream, mArray.begin(), mArraySize));
MOZ_TRY(WriteBuffer(stream, mStringBuffer.get(), mStringBufferSize));
nsresult rv;
nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(stream, &rv);
if (NS_FAILED(rv)) {
return rv;
}
return safeStream->Finish();
}
void DynamicBlocklistWriter::Run() {
MOZ_ASSERT(!NS_IsMainThread());
nsresult rv = NS_ERROR_ABORT;
LauncherRegistryInfo regInfo;
LauncherResult<std::wstring> blocklistFile = regInfo.GetBlocklistFileName();
if (blocklistFile.isOk()) {
const wchar_t* rawBuffer = blocklistFile.inspect().c_str();
rv = WriteToFile(nsDependentString(rawBuffer));
}
NS_DispatchToMainThread(
// Don't capture mPromise by copy because we're not in the main thread
NS_NewRunnableFunction(__func__, [promise = std::move(mPromise), rv]() {
if (NS_SUCCEEDED(rv)) {
promise->MaybeResolve(JS::NullHandleValue);
} else {
promise->MaybeReject(rv);
}
}));
}
void DynamicBlocklistWriter::Cancel() {
MOZ_ASSERT(NS_IsMainThread());
if (mPromise) {
mPromise->MaybeReject(NS_ERROR_ABORT);
}
}
} // namespace mozilla
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