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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "tools/ipc_fuzzer/message_replay/replay_process.h"
#include <limits.h>
#include <string>
#include <tuple>
#include <utility>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_pump_type.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "chrome/common/chrome_switches.h"
#include "content/common/child_process.mojom-test-utils.h"
#include "content/common/content_constants_internal.h"
#include "content/public/common/content_switches.h"
#include "ipc/ipc.mojom.h"
#include "ipc/ipc_channel_mojo.h"
#include "mojo/core/embedder/configuration.h"
#include "mojo/core/embedder/embedder.h"
#include "mojo/core/embedder/scoped_ipc_support.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "mojo/public/cpp/platform/platform_channel.h"
#include "mojo/public/cpp/platform/platform_channel_endpoint.h"
#include "mojo/public/cpp/system/invitation.h"
#if BUILDFLAG(IS_POSIX)
#include "base/posix/global_descriptors.h"
#include "content/public/common/content_descriptors.h"
#endif
namespace ipc_fuzzer {
namespace {
// Used to simulate a basic child process IPC endpoint and bootstrap the legacy
// IPC channel driven by this process.
class FakeChildProcessImpl
: public content::mojom::ChildProcessInterceptorForTesting {
public:
FakeChildProcessImpl() {
std::ignore = disconnected_process_.BindNewPipeAndPassReceiver();
}
// content::mojom::ChildProcessInterceptorForTesting overrides:
content::mojom::ChildProcess* GetForwardingInterface() override {
return disconnected_process_.get();
}
private:
mojo::Remote<content::mojom::ChildProcess> disconnected_process_;
};
} // namespace
void InitializeMojo() {
mojo::core::Configuration config;
config.max_message_num_bytes = 64 * 1024 * 1024;
mojo::core::Init(config);
}
mojo::IncomingInvitation InitializeMojoIPCChannel() {
mojo::PlatformChannelEndpoint endpoint;
#if BUILDFLAG(IS_WIN)
endpoint = mojo::PlatformChannel::RecoverPassedEndpointFromCommandLine(
*base::CommandLine::ForCurrentProcess());
#elif BUILDFLAG(IS_POSIX)
endpoint = mojo::PlatformChannelEndpoint(mojo::PlatformHandle(base::ScopedFD(
base::GlobalDescriptors::GetInstance()->Get(kMojoIPCChannel))));
#endif
CHECK(endpoint.is_valid());
return mojo::IncomingInvitation::Accept(std::move(endpoint));
}
ReplayProcess::ReplayProcess()
: io_thread_("Chrome_ChildIOThread"),
shutdown_event_(base::WaitableEvent::ResetPolicy::MANUAL,
base::WaitableEvent::InitialState::NOT_SIGNALED),
message_index_(0) {}
ReplayProcess::~ReplayProcess() {
channel_.reset();
// Signal this event before shutting down the service process. That way all
// background threads can cleanup.
shutdown_event_.Signal();
io_thread_.Stop();
}
bool ReplayProcess::Initialize(int argc, const char** argv) {
base::CommandLine::Init(argc, argv);
if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kIpcFuzzerTestcase)) {
LOG(ERROR) << "This binary shouldn't be executed directly, "
<< "please use tools/ipc_fuzzer/scripts/play_testcase.py";
return false;
}
// Log to both stderr and file destinations.
logging::SetMinLogLevel(logging::LOGGING_ERROR);
logging::LoggingSettings settings;
settings.logging_dest = logging::LOG_TO_ALL;
settings.log_file_path = FILE_PATH_LITERAL("ipc_replay.log");
logging::InitLogging(settings);
// Make sure to initialize Mojo before starting the IO thread.
InitializeMojo();
io_thread_.StartWithOptions(
base::Thread::Options(base::MessagePumpType::IO, 0));
#if BUILDFLAG(IS_POSIX)
base::GlobalDescriptors* g_fds = base::GlobalDescriptors::GetInstance();
g_fds->Set(kMojoIPCChannel,
kMojoIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
#endif
mojo_ipc_support_.reset(new mojo::core::ScopedIPCSupport(
io_thread_.task_runner(),
mojo::core::ScopedIPCSupport::ShutdownPolicy::FAST));
mojo_invitation_ =
std::make_unique<mojo::IncomingInvitation>(InitializeMojoIPCChannel());
return true;
}
void ReplayProcess::OpenChannel() {
DCHECK(mojo_invitation_);
mojo::ScopedMessagePipeHandle child_process_pipe_for_receiver =
mojo_invitation_->ExtractMessagePipe(
content::kChildProcessReceiverAttachmentName);
mojo::ScopedMessagePipeHandle legacy_ipc_bootstrap_pipe =
mojo_invitation_->ExtractMessagePipe(
content::kLegacyIpcBootstrapAttachmentName);
mojo::MakeSelfOwnedReceiver(
std::make_unique<FakeChildProcessImpl>(),
mojo::PendingReceiver<content::mojom::ChildProcess>(
std::move(child_process_pipe_for_receiver)));
channel_ = IPC::ChannelProxy::Create(
IPC::ChannelMojo::CreateClientFactory(
std::move(legacy_ipc_bootstrap_pipe), io_thread_.task_runner(),
base::SingleThreadTaskRunner::GetCurrentDefault()),
this, io_thread_.task_runner(),
base::SingleThreadTaskRunner::GetCurrentDefault());
}
bool ReplayProcess::OpenTestcase() {
base::FilePath path =
base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
switches::kIpcFuzzerTestcase);
return MessageFile::Read(path, &messages_);
}
void ReplayProcess::SendNextMessage() {
if (message_index_ >= messages_.size()) {
loop_.QuitWhenIdle();
return;
}
std::unique_ptr<IPC::Message> message =
std::move(messages_[message_index_++]);
if (!channel_->Send(message.release())) {
LOG(ERROR) << "ChannelProxy::Send() failed after "
<< message_index_ << " messages";
loop_.QuitWhenIdle();
}
}
void ReplayProcess::Run() {
base::RepeatingTimer timer;
timer.Start(FROM_HERE, base::Milliseconds(1),
base::BindRepeating(&ReplayProcess::SendNextMessage,
base::Unretained(this)));
loop_.Run();
}
bool ReplayProcess::OnMessageReceived(const IPC::Message& msg) {
return true;
}
void ReplayProcess::OnChannelError() {
LOG(ERROR) << "Channel error, quitting after "
<< message_index_ << " messages";
loop_.QuitWhenIdle();
}
} // namespace ipc_fuzzer
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