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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 <mach/mach.h>
#include <stddef.h>
#include <memory>
#include "base/mac/dispatch_source_mach.h"
#include "base/mac/scoped_mach_port.h"
#include "base/mac/scoped_mach_vm.h"
#include "sandbox/mac/message_server.h"
namespace sandbox {
// A Mach message server that operates a receive port. Messages are received
// and then passed to the MessageDemuxer for handling. The Demuxer
// can use the server class to send a reply, forward the message to a
// different port, or reply to the message with a MIG error.
class MachMessageServer : public MessageServer {
// Creates a new Mach message server that will send messages to |demuxer|
// for handling. If the |server_receive_right| is non-NULL, this class will
// take ownership of the port and it will be used to receive messages.
// Otherwise the server will create a new receive right.
// The maximum size of messages is specified by |buffer_size|.
MachMessageServer(MessageDemuxer* demuxer,
mach_port_t server_receive_right,
mach_msg_size_t buffer_size);
~MachMessageServer() override;
// MessageServer:
bool Initialize() override;
void Shutdown() override;
pid_t GetMessageSenderPID(IPCMessage request) override;
IPCMessage CreateReply(IPCMessage request) override;
bool SendReply(IPCMessage reply) override;
void ForwardMessage(IPCMessage request, mach_port_t destination) override;
// Replies to the message with the specified |error_code| as a MIG
// error_reply RetCode.
void RejectMessage(IPCMessage request, int error_code) override;
mach_port_t GetServerPort() const override;
// Event handler for the |server_source_| that reads a message from the queue
// and processes it.
void ReceiveMessage();
// The demuxer delegate. Weak.
MessageDemuxer* demuxer_;
// The Mach port on which the server is receiving requests.
base::mac::ScopedMachReceiveRight server_port_;
// The size of the two message buffers below.
const mach_msg_size_t buffer_size_;
// Request and reply buffers used in ReceiveMessage.
base::mac::ScopedMachVM request_buffer_;
base::mac::ScopedMachVM reply_buffer_;
// MACH_RECV dispatch source that handles the |server_port_|.
std::unique_ptr<base::DispatchSourceMach> dispatch_source_;
// Whether or not ForwardMessage() was called during ReceiveMessage().
bool did_forward_message_;
} // namespace sandbox