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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ipc/mojo/ipc_mojo_bootstrap.h"
#include "base/logging.h"
#include "base/process/process_handle.h"
#include "ipc/ipc_message_utils.h"
#include "ipc/ipc_platform_file.h"
#include "mojo/embedder/platform_channel_pair.h"
namespace IPC {
namespace {
// MojoBootstrap for the server process. You should create the instance
// using MojoBootstrap::Create().
class IPC_MOJO_EXPORT MojoServerBootstrap : public MojoBootstrap {
public:
MojoServerBootstrap();
virtual void OnClientLaunched(base::ProcessHandle process) OVERRIDE;
private:
void SendClientPipe();
void SendClientPipeIfReady();
// Listener implementations
virtual bool OnMessageReceived(const Message& message) OVERRIDE;
virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
mojo::embedder::ScopedPlatformHandle server_pipe_;
base::ProcessHandle client_process_;
bool connected_;
DISALLOW_COPY_AND_ASSIGN(MojoServerBootstrap);
};
MojoServerBootstrap::MojoServerBootstrap()
: client_process_(base::kNullProcessHandle), connected_(false) {
}
void MojoServerBootstrap::SendClientPipe() {
DCHECK_EQ(state(), STATE_INITIALIZED);
DCHECK_NE(client_process_, base::kNullProcessHandle);
DCHECK(connected_);
mojo::embedder::PlatformChannelPair channel_pair;
server_pipe_ = channel_pair.PassServerHandle();
PlatformFileForTransit client_pipe = GetFileHandleForProcess(
#if defined(OS_POSIX)
channel_pair.PassClientHandle().release().fd,
#else
channel_pair.PassClientHandle().release().handle,
#endif
client_process_,
true);
CHECK(client_pipe != IPC::InvalidPlatformFileForTransit());
scoped_ptr<Message> message(new Message());
ParamTraits<PlatformFileForTransit>::Write(message.get(), client_pipe);
Send(message.release());
set_state(STATE_WAITING_ACK);
}
void MojoServerBootstrap::SendClientPipeIfReady() {
// Is the client launched?
if (client_process_ == base::kNullProcessHandle)
return;
// Has the bootstrap channel been made?
if (!connected_)
return;
SendClientPipe();
}
void MojoServerBootstrap::OnClientLaunched(base::ProcessHandle process) {
DCHECK_EQ(state(), STATE_INITIALIZED);
DCHECK_NE(process, base::kNullProcessHandle);
client_process_ = process;
SendClientPipeIfReady();
}
void MojoServerBootstrap::OnChannelConnected(int32 peer_pid) {
DCHECK_EQ(state(), STATE_INITIALIZED);
connected_ = true;
SendClientPipeIfReady();
}
bool MojoServerBootstrap::OnMessageReceived(const Message&) {
DCHECK_EQ(state(), STATE_WAITING_ACK);
set_state(STATE_READY);
delegate()->OnPipeAvailable(
mojo::embedder::ScopedPlatformHandle(server_pipe_.release()));
return true;
}
// MojoBootstrap for client processes. You should create the instance
// using MojoBootstrap::Create().
class IPC_MOJO_EXPORT MojoClientBootstrap : public MojoBootstrap {
public:
MojoClientBootstrap();
virtual void OnClientLaunched(base::ProcessHandle process) OVERRIDE;
private:
// Listener implementations
virtual bool OnMessageReceived(const Message& message) OVERRIDE;
virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
DISALLOW_COPY_AND_ASSIGN(MojoClientBootstrap);
};
MojoClientBootstrap::MojoClientBootstrap() {
}
bool MojoClientBootstrap::OnMessageReceived(const Message& message) {
PlatformFileForTransit pipe;
PickleIterator iter(message);
if (!ParamTraits<PlatformFileForTransit>::Read(&message, &iter, &pipe)) {
DLOG(WARNING) << "Failed to read a file handle from bootstrap channel.";
message.set_dispatch_error();
return false;
}
// Sends ACK back.
Send(new Message());
set_state(STATE_READY);
delegate()->OnPipeAvailable(
mojo::embedder::ScopedPlatformHandle(mojo::embedder::PlatformHandle(
PlatformFileForTransitToPlatformFile(pipe))));
return true;
}
void MojoClientBootstrap::OnClientLaunched(base::ProcessHandle process) {
// This notification should happen only on server processes.
NOTREACHED();
}
void MojoClientBootstrap::OnChannelConnected(int32 peer_pid) {
}
} // namespace
// MojoBootstrap
// static
scoped_ptr<MojoBootstrap> MojoBootstrap::Create(ChannelHandle handle,
Channel::Mode mode,
Delegate* delegate) {
CHECK(mode == Channel::MODE_CLIENT || mode == Channel::MODE_SERVER);
scoped_ptr<MojoBootstrap> self =
mode == Channel::MODE_CLIENT
? scoped_ptr<MojoBootstrap>(new MojoClientBootstrap())
: scoped_ptr<MojoBootstrap>(new MojoServerBootstrap());
scoped_ptr<Channel> bootstrap_channel =
Channel::Create(handle, mode, self.get());
self->Init(bootstrap_channel.Pass(), delegate);
return self.Pass();
}
MojoBootstrap::MojoBootstrap() : delegate_(NULL), state_(STATE_INITIALIZED) {
}
MojoBootstrap::~MojoBootstrap() {
}
void MojoBootstrap::Init(scoped_ptr<Channel> channel, Delegate* delegate) {
channel_ = channel.Pass();
delegate_ = delegate;
}
bool MojoBootstrap::Connect() {
return channel_->Connect();
}
void MojoBootstrap::OnBadMessageReceived(const Message& message) {
delegate_->OnBootstrapError();
}
void MojoBootstrap::OnChannelError() {
if (state_ == STATE_READY)
return;
DLOG(WARNING) << "Detected error on Mojo bootstrap channel.";
delegate()->OnBootstrapError();
}
bool MojoBootstrap::Send(Message* message) {
return channel_->Send(message);
}
#if defined(OS_POSIX) && !defined(OS_NACL)
int MojoBootstrap::GetClientFileDescriptor() const {
return channel_->GetClientFileDescriptor();
}
int MojoBootstrap::TakeClientFileDescriptor() {
return channel_->TakeClientFileDescriptor();
}
#endif // defined(OS_POSIX) && !defined(OS_NACL)
} // namespace IPC
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