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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "ipc/ipc_message_pipe_reader.h"
#include <stdint.h>
#include <utility>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/raw_ref.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "base/trace_event/trace_event.h"
#include "ipc/ipc_channel_mojo.h"
#include "mojo/public/cpp/bindings/message.h"
#include "mojo/public/cpp/bindings/thread_safe_proxy.h"
namespace IPC {
namespace internal {
namespace {
class ThreadSafeProxy : public mojo::ThreadSafeProxy {
public:
using Forwarder = base::RepeatingCallback<void(mojo::Message)>;
ThreadSafeProxy(scoped_refptr<base::SequencedTaskRunner> task_runner,
Forwarder forwarder,
mojo::AssociatedGroupController& group_controller)
: task_runner_(std::move(task_runner)),
forwarder_(std::move(forwarder)),
group_controller_(group_controller) {}
// mojo::ThreadSafeProxy:
void SendMessage(mojo::Message& message) override {
message.SerializeHandles(&*group_controller_);
task_runner_->PostTask(FROM_HERE,
base::BindOnce(forwarder_, std::move(message)));
}
void SendMessageWithResponder(
mojo::Message& message,
std::unique_ptr<mojo::MessageReceiver> responder) override {
// We don't bother supporting this because it's not used in practice.
NOTREACHED();
}
private:
~ThreadSafeProxy() override = default;
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
const Forwarder forwarder_;
const raw_ref<mojo::AssociatedGroupController> group_controller_;
};
} // namespace
MessagePipeReader::MessagePipeReader(
mojo::MessagePipeHandle pipe,
mojo::PendingAssociatedRemote<mojom::Channel> sender,
mojo::PendingAssociatedReceiver<mojom::Channel> receiver,
scoped_refptr<base::SequencedTaskRunner> task_runner,
MessagePipeReader::Delegate* delegate)
: delegate_(delegate),
sender_(std::move(sender), task_runner),
receiver_(this, std::move(receiver), task_runner) {
thread_safe_sender_ =
std::make_unique<mojo::ThreadSafeForwarder<mojom::Channel>>(
base::MakeRefCounted<ThreadSafeProxy>(
task_runner,
base::BindRepeating(&MessagePipeReader::ForwardMessage,
weak_ptr_factory_.GetWeakPtr()),
*sender_.internal_state()->associated_group()->GetController()));
thread_checker_.DetachFromThread();
}
MessagePipeReader::~MessagePipeReader() {
DCHECK(thread_checker_.CalledOnValidThread());
// The pipe should be closed before deletion.
}
void MessagePipeReader::FinishInitializationOnIOThread(
base::ProcessId self_pid) {
sender_.set_disconnect_handler(
base::BindOnce(&MessagePipeReader::OnPipeError, base::Unretained(this),
MOJO_RESULT_FAILED_PRECONDITION));
receiver_.set_disconnect_handler(
base::BindOnce(&MessagePipeReader::OnPipeError, base::Unretained(this),
MOJO_RESULT_FAILED_PRECONDITION));
sender_->SetPeerPid(self_pid);
}
void MessagePipeReader::Close() {
DCHECK(thread_checker_.CalledOnValidThread());
sender_.reset();
if (receiver_.is_bound())
receiver_.reset();
}
bool MessagePipeReader::Send(std::unique_ptr<Message> message) {
CHECK(message->IsValid());
TRACE_EVENT_WITH_FLOW0("toplevel.flow", "MessagePipeReader::Send",
message->flags(), TRACE_EVENT_FLAG_FLOW_OUT);
std::optional<std::vector<mojo::native::SerializedHandlePtr>> handles;
MojoResult result = MOJO_RESULT_OK;
result = ChannelMojo::ReadFromMessageAttachmentSet(message.get(), &handles);
if (result != MOJO_RESULT_OK)
return false;
if (!sender_)
return false;
base::span<const uint8_t> bytes(static_cast<const uint8_t*>(message->data()),
message->size());
sender_->Receive(MessageView(bytes, std::move(handles)));
DVLOG(4) << "Send " << message->type() << ": " << message->size();
return true;
}
void MessagePipeReader::GetRemoteInterface(
mojo::GenericPendingAssociatedReceiver receiver) {
if (!sender_.is_bound())
return;
sender_->GetAssociatedInterface(std::move(receiver));
}
void MessagePipeReader::SetPeerPid(int32_t peer_pid) {
delegate_->OnPeerPidReceived(peer_pid);
}
void MessagePipeReader::Receive(MessageView message_view) {
if (message_view.bytes().empty()) {
delegate_->OnBrokenDataReceived();
return;
}
Message message(reinterpret_cast<const char*>(message_view.bytes().data()),
message_view.bytes().size());
if (!message.IsValid()) {
delegate_->OnBrokenDataReceived();
return;
}
DVLOG(4) << "Receive " << message.type() << ": " << message.size();
MojoResult write_result = ChannelMojo::WriteToMessageAttachmentSet(
message_view.TakeHandles(), &message);
if (write_result != MOJO_RESULT_OK) {
OnPipeError(write_result);
return;
}
TRACE_EVENT_WITH_FLOW0("toplevel.flow", "MessagePipeReader::Receive",
message.flags(), TRACE_EVENT_FLAG_FLOW_IN);
delegate_->OnMessageReceived(message);
}
void MessagePipeReader::GetAssociatedInterface(
mojo::GenericPendingAssociatedReceiver receiver) {
DCHECK(thread_checker_.CalledOnValidThread());
if (delegate_)
delegate_->OnAssociatedInterfaceRequest(std::move(receiver));
}
void MessagePipeReader::OnPipeError(MojoResult error) {
DCHECK(thread_checker_.CalledOnValidThread());
Close();
// NOTE: The delegate call below may delete |this|.
if (delegate_)
delegate_->OnPipeError();
}
void MessagePipeReader::ForwardMessage(mojo::Message message) {
sender_.internal_state()->ForwardMessage(std::move(message));
}
} // namespace internal
} // namespace IPC
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