1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/win/src/sharedmem_ipc_server.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,127 @@
1.4 +// Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
1.9 +#define SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
1.10 +
1.11 +#include <list>
1.12 +
1.13 +#include "base/basictypes.h"
1.14 +#include "base/gtest_prod_util.h"
1.15 +#include "sandbox/win/src/crosscall_params.h"
1.16 +#include "sandbox/win/src/crosscall_server.h"
1.17 +#include "sandbox/win/src/sharedmem_ipc_client.h"
1.18 +
1.19 +// IPC transport implementation that uses shared memory.
1.20 +// This is the server side
1.21 +//
1.22 +// The server side has knowledge about the layout of the shared memory
1.23 +// and the state transitions. Both are explained in sharedmem_ipc_client.h
1.24 +//
1.25 +// As opposed to SharedMemIPClient, the Server object should be one for the
1.26 +// entire lifetime of the target process. The server is in charge of creating
1.27 +// the events (ping, pong) both for the client and for the target that are used
1.28 +// to signal the IPC and also in charge of setting the initial state of the
1.29 +// channels.
1.30 +//
1.31 +// When an IPC is ready, the server relies on being called by on the
1.32 +// ThreadPingEventReady callback. The IPC server then retrieves the buffer,
1.33 +// marshals it into a CrossCallParam object and calls the Dispatcher, who is in
1.34 +// charge of fulfilling the IPC request.
1.35 +namespace sandbox {
1.36 +
1.37 +// the shared memory implementation of the IPC server. There should be one
1.38 +// of these objects per target (IPC client) process
1.39 +class SharedMemIPCServer {
1.40 + public:
1.41 + // Creates the IPC server.
1.42 + // target_process: handle to the target process. It must be suspended.
1.43 + // target_process_id: process id of the target process.
1.44 + // target_job: the job object handle associated with the target process.
1.45 + // thread_provider: a thread provider object.
1.46 + // dispatcher: an object that can service IPC calls.
1.47 + SharedMemIPCServer(HANDLE target_process, DWORD target_process_id,
1.48 + HANDLE target_job, ThreadProvider* thread_provider,
1.49 + Dispatcher* dispatcher);
1.50 +
1.51 + ~SharedMemIPCServer();
1.52 +
1.53 + // Initializes the server structures, shared memory structures and
1.54 + // creates the kernels events used to signal the IPC.
1.55 + bool Init(void* shared_mem, uint32 shared_size, uint32 channel_size);
1.56 +
1.57 + private:
1.58 + // Allow tests to be marked DISABLED_. Note that FLAKY_ and FAILS_ prefixes
1.59 + // do not work with sandbox tests.
1.60 + FRIEND_TEST_ALL_PREFIXES(IPCTest, SharedMemServerTests);
1.61 + // When an event fires (IPC request). A thread from the ThreadProvider
1.62 + // will call this function. The context parameter should be the same as
1.63 + // provided when ThreadProvider::RegisterWait was called.
1.64 + static void __stdcall ThreadPingEventReady(void* context,
1.65 + unsigned char);
1.66 +
1.67 + // Makes the client and server events. This function is called once
1.68 + // per channel.
1.69 + bool MakeEvents(HANDLE* server_ping, HANDLE* server_pong,
1.70 + HANDLE* client_ping, HANDLE* client_pong);
1.71 +
1.72 + // A copy this structure is maintained per channel.
1.73 + // Note that a lot of the fields are just the same of what we have in the IPC
1.74 + // object itself. It is better to have the copies since we can dispatch in the
1.75 + // static method without worrying about converting back to a member function
1.76 + // call or about threading issues.
1.77 + struct ServerControl {
1.78 + // This channel server ping event.
1.79 + HANDLE ping_event;
1.80 + // This channel server pong event.
1.81 + HANDLE pong_event;
1.82 + // The size of this channel.
1.83 + uint32 channel_size;
1.84 + // The pointer to the actual channel data.
1.85 + char* channel_buffer;
1.86 + // The pointer to the base of the shared memory.
1.87 + char* shared_base;
1.88 + // A pointer to this channel's client-side control structure this structure
1.89 + // lives in the shared memory.
1.90 + ChannelControl* channel;
1.91 + // the IPC dispatcher associated with this channel.
1.92 + Dispatcher* dispatcher;
1.93 + // The target process information associated with this channel.
1.94 + ClientInfo target_info;
1.95 + };
1.96 +
1.97 + // Looks for the appropriate handler for this IPC and invokes it.
1.98 + static bool InvokeCallback(const ServerControl* service_context,
1.99 + void* ipc_buffer, CrossCallReturn* call_result);
1.100 +
1.101 + // Points to the shared memory channel control which lives at
1.102 + // the start of the shared section.
1.103 + IPCControl* client_control_;
1.104 +
1.105 + // Keeps track of the server side objects that are used to answer an IPC.
1.106 + typedef std::list<ServerControl*> ServerContexts;
1.107 + ServerContexts server_contexts_;
1.108 +
1.109 + // The thread provider provides the threads that call back into this object
1.110 + // when the IPC events fire.
1.111 + ThreadProvider* thread_provider_;
1.112 +
1.113 + // The IPC object is associated with a target process.
1.114 + HANDLE target_process_;
1.115 +
1.116 + // The target process id associated with the IPC object.
1.117 + DWORD target_process_id_;
1.118 +
1.119 + // The target object is inside a job too.
1.120 + HANDLE target_job_object_;
1.121 +
1.122 + // The dispatcher handles 'ready' IPC calls.
1.123 + Dispatcher* call_dispatcher_;
1.124 +
1.125 + DISALLOW_COPY_AND_ASSIGN(SharedMemIPCServer);
1.126 +};
1.127 +
1.128 +} // namespace sandbox
1.129 +
1.130 +#endif // SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
