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fune/ipc/glue/InputStreamUtils.cpp
Nika Layzell e983da120a Bug 1706375 - Support building ipc/glue in non-unified mode, r=ipc-reviewers,mccr8 
This both helps IDE integration and will help avoid build issues which would've
otherwise cropped up when adding new files to the directory for bug 1706374.

Differential Revision: https://phabricator.services.mozilla.com/D112764
2021-04-22 14:32:03 +00:00

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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 http://mozilla.org/MPL/2.0/. */
#include "InputStreamUtils.h"
#include "nsIIPCSerializableInputStream.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/quota/DecryptingInputStream_impl.h"
#include "mozilla/dom/quota/IPCStreamCipherStrategy.h"
#include "mozilla/ipc/IPCStreamDestination.h"
#include "mozilla/ipc/IPCStreamSource.h"
#include "mozilla/InputStreamLengthHelper.h"
#include "mozilla/RemoteLazyInputStream.h"
#include "mozilla/RemoteLazyInputStreamChild.h"
#include "mozilla/RemoteLazyInputStreamStorage.h"
#include "mozilla/SlicedInputStream.h"
#include "mozilla/InputStreamLengthWrapper.h"
#include "nsBufferedStreams.h"
#include "nsComponentManagerUtils.h"
#include "nsDebug.h"
#include "nsFileStreams.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsID.h"
#include "nsIMIMEInputStream.h"
#include "nsIMultiplexInputStream.h"
#include "nsIPipe.h"
#include "nsMIMEInputStream.h"
#include "nsMultiplexInputStream.h"
#include "nsNetCID.h"
#include "nsStreamUtils.h"
#include "nsStringStream.h"
#include "nsXULAppAPI.h"
using namespace mozilla;
using namespace mozilla::dom;
namespace mozilla {
namespace ipc {
namespace {
template <typename M>
void SerializeInputStreamInternal(nsIInputStream* aInputStream,
InputStreamParams& aParams,
nsTArray<FileDescriptor>& aFileDescriptors,
bool aDelayedStart, uint32_t aMaxSize,
uint32_t* aSizeUsed, M* aManager) {
MOZ_ASSERT(aInputStream);
MOZ_ASSERT(aManager);
nsCOMPtr<nsIIPCSerializableInputStream> serializable =
do_QueryInterface(aInputStream);
if (!serializable) {
MOZ_CRASH("Input stream is not serializable!");
}
serializable->Serialize(aParams, aFileDescriptors, aDelayedStart, aMaxSize,
aSizeUsed, aManager);
if (aParams.type() == InputStreamParams::T__None) {
MOZ_CRASH("Serialize failed!");
}
}
template <typename M>
void SerializeInputStreamAsPipeInternal(nsIInputStream* aInputStream,
InputStreamParams& aParams,
bool aDelayedStart, M* aManager) {
MOZ_ASSERT(aInputStream);
MOZ_ASSERT(aManager);
// Let's try to take the length using InputStreamLengthHelper. If the length
// cannot be taken synchronously, and its length is needed, the stream needs
// to be fully copied in memory on the deserialization side.
int64_t length;
if (!InputStreamLengthHelper::GetSyncLength(aInputStream, &length)) {
length = -1;
}
nsCOMPtr<nsIAsyncInputStream> asyncStream = do_QueryInterface(aInputStream);
// As a fallback, attempt to stream the data across using a IPCStream
// actor. For blocking streams, create a nonblocking pipe instead,
bool nonBlocking = false;
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(aInputStream->IsNonBlocking(&nonBlocking)));
if (!nonBlocking || !asyncStream) {
const uint32_t kBufferSize = 32768; // matches IPCStream buffer size.
nsCOMPtr<nsIAsyncOutputStream> sink;
nsresult rv = NS_NewPipe2(getter_AddRefs(asyncStream), getter_AddRefs(sink),
true, false, kBufferSize, UINT32_MAX);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsCOMPtr<nsIEventTarget> target =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
// Since the source stream could be used by others, let's not close it when
// the copy is done.
rv = NS_AsyncCopy(aInputStream, sink, target, NS_ASYNCCOPY_VIA_READSEGMENTS,
kBufferSize, nullptr, nullptr, false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
MOZ_DIAGNOSTIC_ASSERT(asyncStream);
auto* streamSource = IPCStreamSource::Create(asyncStream, aManager);
if (NS_WARN_IF(!streamSource)) {
// Failed to create IPCStreamSource, which would cause a failure should we
// attempt to serialize it later. So abort now.
return;
}
aParams = IPCRemoteStreamParams(aDelayedStart, streamSource, length);
}
} // namespace
void InputStreamHelper::SerializeInputStream(
nsIInputStream* aInputStream, InputStreamParams& aParams,
nsTArray<FileDescriptor>& aFileDescriptors, bool aDelayedStart,
uint32_t aMaxSize, uint32_t* aSizeUsed,
ParentToChildStreamActorManager* aManager) {
SerializeInputStreamInternal(aInputStream, aParams, aFileDescriptors,
aDelayedStart, aMaxSize, aSizeUsed, aManager);
}
void InputStreamHelper::SerializeInputStream(
nsIInputStream* aInputStream, InputStreamParams& aParams,
nsTArray<FileDescriptor>& aFileDescriptors, bool aDelayedStart,
uint32_t aMaxSize, uint32_t* aSizeUsed,
ChildToParentStreamActorManager* aManager) {
SerializeInputStreamInternal(aInputStream, aParams, aFileDescriptors,
aDelayedStart, aMaxSize, aSizeUsed, aManager);
}
void InputStreamHelper::SerializeInputStreamAsPipe(
nsIInputStream* aInputStream, InputStreamParams& aParams,
bool aDelayedStart, ParentToChildStreamActorManager* aManager) {
SerializeInputStreamAsPipeInternal(aInputStream, aParams, aDelayedStart,
aManager);
}
void InputStreamHelper::SerializeInputStreamAsPipe(
nsIInputStream* aInputStream, InputStreamParams& aParams,
bool aDelayedStart, ChildToParentStreamActorManager* aManager) {
SerializeInputStreamAsPipeInternal(aInputStream, aParams, aDelayedStart,
aManager);
}
void InputStreamHelper::PostSerializationActivation(InputStreamParams& aParams,
bool aConsumedByIPC,
bool aDelayedStart) {
switch (aParams.type()) {
case InputStreamParams::TBufferedInputStreamParams: {
BufferedInputStreamParams& params =
aParams.get_BufferedInputStreamParams();
InputStreamHelper::PostSerializationActivation(
params.optionalStream(), aConsumedByIPC, aDelayedStart);
return;
}
case InputStreamParams::TMIMEInputStreamParams: {
MIMEInputStreamParams& params = aParams.get_MIMEInputStreamParams();
InputStreamHelper::PostSerializationActivation(
params.optionalStream(), aConsumedByIPC, aDelayedStart);
return;
}
case InputStreamParams::TMultiplexInputStreamParams: {
MultiplexInputStreamParams& params =
aParams.get_MultiplexInputStreamParams();
for (InputStreamParams& subParams : params.streams()) {
InputStreamHelper::PostSerializationActivation(
subParams, aConsumedByIPC, aDelayedStart);
}
return;
}
case InputStreamParams::TSlicedInputStreamParams: {
SlicedInputStreamParams& params = aParams.get_SlicedInputStreamParams();
InputStreamHelper::PostSerializationActivation(
params.stream(), aConsumedByIPC, aDelayedStart);
return;
}
case InputStreamParams::TInputStreamLengthWrapperParams: {
InputStreamLengthWrapperParams& params =
aParams.get_InputStreamLengthWrapperParams();
InputStreamHelper::PostSerializationActivation(
params.stream(), aConsumedByIPC, aDelayedStart);
return;
}
case InputStreamParams::TIPCRemoteStreamParams: {
IPCRemoteStreamType& remoteInputStream =
aParams.get_IPCRemoteStreamParams().stream();
IPCStreamSource* source = nullptr;
if (remoteInputStream.type() ==
IPCRemoteStreamType::TPChildToParentStreamChild) {
source = IPCStreamSource::Cast(
remoteInputStream.get_PChildToParentStreamChild());
} else {
MOZ_ASSERT(remoteInputStream.type() ==
IPCRemoteStreamType::TPParentToChildStreamParent);
source = IPCStreamSource::Cast(
remoteInputStream.get_PParentToChildStreamParent());
}
MOZ_ASSERT(source);
// If the source stream has not been taken to be sent to the other side,
// we can destroy it.
if (!aConsumedByIPC) {
source->StartDestroy();
return;
}
if (!aDelayedStart) {
// If we don't need to do a delayedStart, we start it now. Otherwise,
// the Start() will be called at the first use by the
// IPCStreamDestination::DelayedStartInputStream.
source->Start();
}
return;
}
case InputStreamParams::TStringInputStreamParams:
break;
case InputStreamParams::TFileInputStreamParams:
break;
case InputStreamParams::TRemoteLazyInputStreamParams:
break;
case InputStreamParams::TEncryptedFileInputStreamParams:
break;
default:
MOZ_CRASH(
"A new stream? Should decide if it must be processed recursively or "
"not.");
}
}
void InputStreamHelper::PostSerializationActivation(
Maybe<InputStreamParams>& aParams, bool aConsumedByIPC,
bool aDelayedStart) {
if (aParams.isSome()) {
InputStreamHelper::PostSerializationActivation(
aParams.ref(), aConsumedByIPC, aDelayedStart);
}
}
already_AddRefed<nsIInputStream> InputStreamHelper::DeserializeInputStream(
const InputStreamParams& aParams,
const nsTArray<FileDescriptor>& aFileDescriptors) {
if (aParams.type() == InputStreamParams::TRemoteLazyInputStreamParams) {
const RemoteLazyInputStreamParams& params =
aParams.get_RemoteLazyInputStreamParams();
// RemoteLazyInputStreamRefs are not deserializable on the parent side,
// because the parent is the only one that has a copy of the original stream
// in the RemoteLazyInputStreamStorage.
if (params.type() ==
RemoteLazyInputStreamParams::TRemoteLazyInputStreamRef) {
MOZ_ASSERT(XRE_IsParentProcess());
const RemoteLazyInputStreamRef& ref =
params.get_RemoteLazyInputStreamRef();
auto storage = RemoteLazyInputStreamStorage::Get().unwrapOr(nullptr);
MOZ_ASSERT(storage);
nsCOMPtr<nsIInputStream> stream;
storage->GetStream(ref.id(), ref.start(), ref.length(),
getter_AddRefs(stream));
return stream.forget();
}
// parent -> child serializations receive an RemoteLazyInputStream actor.
MOZ_ASSERT(params.type() ==
RemoteLazyInputStreamParams::TPRemoteLazyInputStreamChild);
RemoteLazyInputStreamChild* actor =
static_cast<RemoteLazyInputStreamChild*>(
params.get_PRemoteLazyInputStreamChild());
nsCOMPtr<nsIInputStream> stream = actor->CreateStream();
return stream.forget();
}
if (aParams.type() == InputStreamParams::TIPCRemoteStreamParams) {
const IPCRemoteStreamParams& remoteStream =
aParams.get_IPCRemoteStreamParams();
const IPCRemoteStreamType& remoteStreamType = remoteStream.stream();
IPCStreamDestination* destinationStream;
if (remoteStreamType.type() ==
IPCRemoteStreamType::TPChildToParentStreamParent) {
destinationStream = IPCStreamDestination::Cast(
remoteStreamType.get_PChildToParentStreamParent());
} else {
MOZ_ASSERT(remoteStreamType.type() ==
IPCRemoteStreamType::TPParentToChildStreamChild);
destinationStream = IPCStreamDestination::Cast(
remoteStreamType.get_PParentToChildStreamChild());
}
destinationStream->SetDelayedStart(remoteStream.delayedStart());
destinationStream->SetLength(remoteStream.length());
return destinationStream->TakeReader();
}
nsCOMPtr<nsIIPCSerializableInputStream> serializable;
switch (aParams.type()) {
case InputStreamParams::TStringInputStreamParams: {
nsCOMPtr<nsIInputStream> stream;
NS_NewCStringInputStream(getter_AddRefs(stream), ""_ns);
serializable = do_QueryInterface(stream);
} break;
case InputStreamParams::TFileInputStreamParams: {
nsCOMPtr<nsIFileInputStream> stream;
nsFileInputStream::Create(nullptr, NS_GET_IID(nsIFileInputStream),
getter_AddRefs(stream));
serializable = do_QueryInterface(stream);
} break;
case InputStreamParams::TBufferedInputStreamParams: {
nsCOMPtr<nsIBufferedInputStream> stream;
nsBufferedInputStream::Create(nullptr, NS_GET_IID(nsIBufferedInputStream),
getter_AddRefs(stream));
serializable = do_QueryInterface(stream);
} break;
case InputStreamParams::TMIMEInputStreamParams: {
nsCOMPtr<nsIMIMEInputStream> stream;
nsMIMEInputStreamConstructor(nullptr, NS_GET_IID(nsIMIMEInputStream),
getter_AddRefs(stream));
serializable = do_QueryInterface(stream);
} break;
case InputStreamParams::TMultiplexInputStreamParams: {
nsCOMPtr<nsIMultiplexInputStream> stream;
nsMultiplexInputStreamConstructor(
nullptr, NS_GET_IID(nsIMultiplexInputStream), getter_AddRefs(stream));
serializable = do_QueryInterface(stream);
} break;
case InputStreamParams::TSlicedInputStreamParams:
serializable = new SlicedInputStream();
break;
case InputStreamParams::TInputStreamLengthWrapperParams:
serializable = new InputStreamLengthWrapper();
break;
case InputStreamParams::TEncryptedFileInputStreamParams:
serializable = new dom::quota::DecryptingInputStream<
dom::quota::IPCStreamCipherStrategy>();
break;
default:
MOZ_ASSERT(false, "Unknown params!");
return nullptr;
}
MOZ_ASSERT(serializable);
if (!serializable->Deserialize(aParams, aFileDescriptors)) {
MOZ_ASSERT(false, "Deserialize failed!");
return nullptr;
}
nsCOMPtr<nsIInputStream> stream = do_QueryInterface(serializable);
MOZ_ASSERT(stream);
return stream.forget();
}
} // namespace ipc
} // namespace mozilla
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