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// Copyright 2016 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 "mojo/edk/system/broker_host.h"
#include <fcntl.h>
#include <unistd.h>
#include <utility>
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop/message_loop.h"
#include "mojo/edk/embedder/embedder_internal.h"
#include "mojo/edk/embedder/platform_channel_utils_posix.h"
#include "mojo/edk/embedder/platform_handle_vector.h"
#include "mojo/edk/embedder/platform_shared_buffer.h"
#include "mojo/edk/embedder/platform_support.h"
#include "mojo/edk/system/broker_messages.h"
namespace mojo {
namespace edk {
namespace {
// To prevent abuse, limit the maximum size of shared memory buffers.
// TODO(amistry): Re-consider this limit, or do something smarter.
const size_t kMaxSharedBufferSize = 16 * 1024 * 1024;
}
BrokerHost::BrokerHost(ScopedPlatformHandle platform_handle) {
CHECK(platform_handle.is_valid());
base::MessageLoop::current()->AddDestructionObserver(this);
channel_ = Channel::Create(this, std::move(platform_handle),
base::MessageLoop::current()->task_runner());
channel_->Start();
}
BrokerHost::~BrokerHost() {
// We're always destroyed on the creation thread, which is the IO thread.
base::MessageLoop::current()->RemoveDestructionObserver(this);
if (channel_)
channel_->ShutDown();
}
void BrokerHost::SendChannel(ScopedPlatformHandle handle) {
CHECK(handle.is_valid());
CHECK(channel_);
Channel::MessagePtr message =
CreateBrokerMessage(BrokerMessageType::INIT, 1, nullptr);
ScopedPlatformHandleVectorPtr handles;
handles.reset(new PlatformHandleVector(1));
handles->at(0) = handle.release();
message->SetHandles(std::move(handles));
channel_->Write(std::move(message));
}
void BrokerHost::OnBufferRequest(size_t num_bytes) {
scoped_refptr<PlatformSharedBuffer> buffer;
if (num_bytes <= kMaxSharedBufferSize) {
buffer = internal::g_platform_support->CreateSharedBuffer(num_bytes);
} else {
LOG(ERROR) << "Shared buffer request too large: " << num_bytes;
}
Channel::MessagePtr message = CreateBrokerMessage(
BrokerMessageType::BUFFER_RESPONSE, buffer ? 1 : 0, nullptr);
if (buffer) {
ScopedPlatformHandleVectorPtr handles;
handles.reset(new PlatformHandleVector(1));
handles->at(0) = buffer->PassPlatformHandle().release();
message->SetHandles(std::move(handles));
}
channel_->Write(std::move(message));
}
void BrokerHost::OnChannelMessage(const void* payload,
size_t payload_size,
ScopedPlatformHandleVectorPtr handles) {
const BrokerMessageHeader* header =
static_cast<const BrokerMessageHeader*>(payload);
switch (header->type) {
case BrokerMessageType::BUFFER_REQUEST: {
const BufferRequestData* request =
reinterpret_cast<const BufferRequestData*>(header + 1);
OnBufferRequest(request->size);
break;
}
default:
LOG(ERROR) << "Unexpected broker message type: " << header->type;
break;
}
}
void BrokerHost::OnChannelError() {
if (channel_) {
channel_->ShutDown();
channel_ = nullptr;
}
delete this;
}
void BrokerHost::WillDestroyCurrentMessageLoop() {
delete this;
}
} // namespace edk
} // namespace mojo
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