зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
5.0 KiB
C++
128 строки
5.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
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#define SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
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#include <list>
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#include "base/basictypes.h"
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#include "base/gtest_prod_util.h"
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#include "sandbox/win/src/crosscall_params.h"
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#include "sandbox/win/src/crosscall_server.h"
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#include "sandbox/win/src/sharedmem_ipc_client.h"
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// IPC transport implementation that uses shared memory.
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// This is the server side
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//
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// The server side has knowledge about the layout of the shared memory
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// and the state transitions. Both are explained in sharedmem_ipc_client.h
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//
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// As opposed to SharedMemIPClient, the Server object should be one for the
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// entire lifetime of the target process. The server is in charge of creating
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// the events (ping, pong) both for the client and for the target that are used
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// to signal the IPC and also in charge of setting the initial state of the
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// channels.
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//
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// When an IPC is ready, the server relies on being called by on the
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// ThreadPingEventReady callback. The IPC server then retrieves the buffer,
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// marshals it into a CrossCallParam object and calls the Dispatcher, who is in
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// charge of fulfilling the IPC request.
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namespace sandbox {
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// the shared memory implementation of the IPC server. There should be one
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// of these objects per target (IPC client) process
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class SharedMemIPCServer {
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public:
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// Creates the IPC server.
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// target_process: handle to the target process. It must be suspended.
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// target_process_id: process id of the target process.
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// target_job: the job object handle associated with the target process.
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// thread_provider: a thread provider object.
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// dispatcher: an object that can service IPC calls.
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SharedMemIPCServer(HANDLE target_process, DWORD target_process_id,
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HANDLE target_job, ThreadProvider* thread_provider,
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Dispatcher* dispatcher);
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~SharedMemIPCServer();
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// Initializes the server structures, shared memory structures and
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// creates the kernels events used to signal the IPC.
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bool Init(void* shared_mem, uint32 shared_size, uint32 channel_size);
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private:
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// Allow tests to be marked DISABLED_. Note that FLAKY_ and FAILS_ prefixes
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// do not work with sandbox tests.
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FRIEND_TEST_ALL_PREFIXES(IPCTest, SharedMemServerTests);
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// When an event fires (IPC request). A thread from the ThreadProvider
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// will call this function. The context parameter should be the same as
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// provided when ThreadProvider::RegisterWait was called.
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static void __stdcall ThreadPingEventReady(void* context,
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unsigned char);
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// Makes the client and server events. This function is called once
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// per channel.
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bool MakeEvents(HANDLE* server_ping, HANDLE* server_pong,
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HANDLE* client_ping, HANDLE* client_pong);
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// A copy this structure is maintained per channel.
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// Note that a lot of the fields are just the same of what we have in the IPC
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// object itself. It is better to have the copies since we can dispatch in the
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// static method without worrying about converting back to a member function
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// call or about threading issues.
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struct ServerControl {
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// This channel server ping event.
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HANDLE ping_event;
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// This channel server pong event.
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HANDLE pong_event;
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// The size of this channel.
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uint32 channel_size;
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// The pointer to the actual channel data.
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char* channel_buffer;
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// The pointer to the base of the shared memory.
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char* shared_base;
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// A pointer to this channel's client-side control structure this structure
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// lives in the shared memory.
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ChannelControl* channel;
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// the IPC dispatcher associated with this channel.
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Dispatcher* dispatcher;
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// The target process information associated with this channel.
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ClientInfo target_info;
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};
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// Looks for the appropriate handler for this IPC and invokes it.
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static bool InvokeCallback(const ServerControl* service_context,
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void* ipc_buffer, CrossCallReturn* call_result);
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// Points to the shared memory channel control which lives at
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// the start of the shared section.
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IPCControl* client_control_;
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// Keeps track of the server side objects that are used to answer an IPC.
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typedef std::list<ServerControl*> ServerContexts;
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ServerContexts server_contexts_;
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// The thread provider provides the threads that call back into this object
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// when the IPC events fire.
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ThreadProvider* thread_provider_;
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// The IPC object is associated with a target process.
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HANDLE target_process_;
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// The target process id associated with the IPC object.
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DWORD target_process_id_;
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// The target object is inside a job too.
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HANDLE target_job_object_;
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// The dispatcher handles 'ready' IPC calls.
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Dispatcher* call_dispatcher_;
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DISALLOW_COPY_AND_ASSIGN(SharedMemIPCServer);
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};
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} // namespace sandbox
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#endif // SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
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