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// Copyright (c) 2010 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 <list>
#include "base/basictypes.h"
#include "sandbox/src/crosscall_params.h"
#include "sandbox/src/crosscall_server.h"
#include "sandbox/src/sharedmem_ipc_client.h"
#include "testing/gtest/include/gtest/gtest_prod.h"
// IPC transport implementation that uses shared memory.
// This is the server side
// The server side has knowledge about the layout of the shared memory
// and the state transitions. Both are explained in sharedmem_ipc_client.h
// As opposed to SharedMemIPClient, the Server object should be one for the
// entire lifetime of the target process. The server is in charge of creating
// the events (ping, pong) both for the client and for the target that are used
// to signal the IPC and also in charge of setting the initial state of the
// channels.
// When an IPC is ready, the server relies on being called by on the
// ThreadPingEventReady callback. The IPC server then retrieves the buffer,
// marshals it into a CrossCallParam object and calls the Dispatcher, who is in
// charge of fulfilling the IPC request.
namespace sandbox {
// the shared memory implementation of the IPC server. There should be one
// of these objects per target (IPC client) process
class SharedMemIPCServer {
// Creates the IPC server.
// target_process: handle to the target process. It must be suspended.
// target_process_id: process id of the target process.
// target_job: the job object handle associated with the target process.
// thread_provider: a thread provider object.
// dispatcher: an object that can service IPC calls.
SharedMemIPCServer(HANDLE target_process, DWORD target_process_id,
HANDLE target_job, ThreadProvider* thread_provider,
Dispatcher* dispatcher);
// Initializes the server structures, shared memory structures and
// creates the kernels events used to signal the IPC.
bool Init(void* shared_mem, size_t shared_size, size_t channel_size);
FRIEND_TEST(IPCTest, SharedMemServerTests);
// When an event fires (IPC request). A thread from the ThreadProvider
// will call this function. The context parameter should be the same as
// provided when ThreadProvider::RegisterWait was called.
static void __stdcall ThreadPingEventReady(void* context,
unsigned char);
// Makes the client and server events. This function is called once
// per channel.
bool MakeEvents(HANDLE* server_ping, HANDLE* server_pong,
HANDLE* client_ping, HANDLE* client_pong);
// A copy this structure is maintained per channel.
// Note that a lot of the fields are just the same of what we have in the IPC
// object itself. It is better to have the copies since we can dispatch in the
// static method without worrying about converting back to a member function
// call or about threading issues.
struct ServerControl {
// This channel server ping event.
HANDLE ping_event;
// This channel server pong event.
HANDLE pong_event;
// The size of this channel.
size_t channel_size;
// The pointer to the actual channel data.
char* channel_buffer;
// The pointer to the base of the shared memory.
char* shared_base;
// A pointer to this channel's client-side control structure this structure
// lives in the shared memory.
ChannelControl* channel;
// the IPC dispatcher associated with this channel.
Dispatcher* dispatcher;
// The target process information associated with this channel.
ClientInfo target_info;
// Looks for the appropriate handler for this IPC and invokes it.
static bool InvokeCallback(const ServerControl* service_context,
void* ipc_buffer, CrossCallReturn* call_result);
// Points to the shared memory channel control which lives at
// the start of the shared section.
IPCControl* client_control_;
// Keeps track of the server side objects that are used to answer an IPC.
typedef std::list<ServerControl*> ServerContexts;
ServerContexts server_contexts_;
// The thread provider provides the threads that call back into this object
// when the IPC events fire.
ThreadProvider* thread_provider_;
// The IPC object is associated with a target process.
HANDLE target_process_;
// The target process id associated with the IPC object.
DWORD target_process_id_;
// The target object is inside a job too.
HANDLE target_job_object_;
// The dispatcher handles 'ready' IPC calls.
Dispatcher* call_dispatcher_;
} // namespace sandbox