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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 "IPCStreamUtils.h"
#include "ipc/IPCMessageUtilsSpecializations.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsIIPCSerializableInputStream.h"
#include "mozIRemoteLazyInputStream.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/File.h"
#include "mozilla/ipc/IPCStream.h"
#include "mozilla/ipc/InputStreamUtils.h"
#include "mozilla/InputStreamLengthHelper.h"
#include "mozilla/RemoteLazyInputStreamParent.h"
#include "nsIMIMEInputStream.h"
#include "nsNetCID.h"
using namespace mozilla::dom;
namespace mozilla::ipc {
namespace {
class MIMEStreamHeaderVisitor final : public nsIHttpHeaderVisitor {
public:
explicit MIMEStreamHeaderVisitor(
nsTArray<mozilla::ipc::HeaderEntry>& aHeaders)
: mHeaders(aHeaders) {}
NS_DECL_ISUPPORTS
NS_IMETHOD VisitHeader(const nsACString& aName,
const nsACString& aValue) override {
auto el = mHeaders.AppendElement();
el->name() = aName;
el->value() = aValue;
return NS_OK;
}
private:
~MIMEStreamHeaderVisitor() = default;
nsTArray<mozilla::ipc::HeaderEntry>& mHeaders;
};
NS_IMPL_ISUPPORTS(MIMEStreamHeaderVisitor, nsIHttpHeaderVisitor)
static bool SerializeLazyInputStream(nsIInputStream* aStream,
IPCStream& aValue) {
MOZ_ASSERT(aStream);
MOZ_ASSERT(XRE_IsParentProcess());
// If we're serializing a MIME stream, ensure we preserve header data which
// would not be preserved by a RemoteLazyInputStream wrapper.
if (nsCOMPtr<nsIMIMEInputStream> mimeStream = do_QueryInterface(aStream)) {
MIMEInputStreamParams params;
params.startedReading() = false;
nsCOMPtr<nsIHttpHeaderVisitor> visitor =
new MIMEStreamHeaderVisitor(params.headers());
if (NS_WARN_IF(NS_FAILED(mimeStream->VisitHeaders(visitor)))) {
return false;
}
nsCOMPtr<nsIInputStream> dataStream;
if (NS_FAILED(mimeStream->GetData(getter_AddRefs(dataStream)))) {
return false;
}
if (dataStream) {
IPCStream data;
if (!SerializeLazyInputStream(dataStream, data)) {
return false;
}
params.optionalStream().emplace(std::move(data.stream()));
}
aValue.stream() = std::move(params);
return true;
}
RefPtr<RemoteLazyInputStream> lazyStream =
RemoteLazyInputStream::WrapStream(aStream);
if (NS_WARN_IF(!lazyStream)) {
return false;
}
aValue.stream() = RemoteLazyInputStreamParams(WrapNotNull(lazyStream));
return true;
}
} // anonymous namespace
bool SerializeIPCStream(already_AddRefed<nsIInputStream> aInputStream,
IPCStream& aValue, bool aAllowLazy) {
nsCOMPtr<nsIInputStream> stream(std::move(aInputStream));
if (!stream) {
MOZ_ASSERT_UNREACHABLE(
"Use the Maybe<...> overload to serialize optional nsIInputStreams");
return false;
}
// When requesting a delayed start stream from the parent process, serialize
// it as a remote lazy stream to avoid bloating payloads.
if (aAllowLazy && XRE_IsParentProcess()) {
return SerializeLazyInputStream(stream, aValue);
}
if (nsCOMPtr<nsIIPCSerializableInputStream> serializable =
do_QueryInterface(stream)) {
// If you change this size, please also update the payload size in
// test_reload_large_postdata.html.
const uint64_t kTooLargeStream = 1024 * 1024;
uint32_t sizeUsed = 0;
serializable->Serialize(aValue.stream(), kTooLargeStream, &sizeUsed);
MOZ_ASSERT(sizeUsed <= kTooLargeStream);
if (aValue.stream().type() == InputStreamParams::T__None) {
MOZ_CRASH("Serialize failed!");
}
return true;
}
InputStreamHelper::SerializeInputStreamAsPipe(stream, aValue.stream());
if (aValue.stream().type() == InputStreamParams::T__None) {
// This can fail from OOM, etc. We will likely MOZ_CRASH now
return false;
}
return true;
}
bool SerializeIPCStream(already_AddRefed<nsIInputStream> aInputStream,
Maybe<IPCStream>& aValue, bool aAllowLazy) {
nsCOMPtr<nsIInputStream> stream(std::move(aInputStream));
if (!stream) {
aValue.reset();
return true;
}
IPCStream value;
if (SerializeIPCStream(stream.forget(), value, aAllowLazy)) {
aValue = Some(value);
return true;
}
return false;
}
already_AddRefed<nsIInputStream> DeserializeIPCStream(const IPCStream& aValue) {
return InputStreamHelper::DeserializeInputStream(aValue.stream());
}
already_AddRefed<nsIInputStream> DeserializeIPCStream(
const Maybe<IPCStream>& aValue) {
if (aValue.isNothing()) {
return nullptr;
}
return DeserializeIPCStream(aValue.ref());
}
} // namespace mozilla::ipc
void IPC::ParamTraits<nsIInputStream*>::Write(IPC::MessageWriter* aWriter,
nsIInputStream* aParam) {
mozilla::Maybe<mozilla::ipc::IPCStream> stream;
if (!mozilla::ipc::SerializeIPCStream(do_AddRef(aParam), stream,
/* aAllowLazy */ true)) {
MOZ_CRASH("Failed to serialize nsIInputStream");
}
WriteParam(aWriter, stream);
}
bool IPC::ParamTraits<nsIInputStream*>::Read(IPC::MessageReader* aReader,
RefPtr<nsIInputStream>* aResult) {
mozilla::Maybe<mozilla::ipc::IPCStream> ipcStream;
if (!ReadParam(aReader, &ipcStream)) {
return false;
}
*aResult = mozilla::ipc::DeserializeIPCStream(ipcStream);
return true;
}
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