The Tor Browser: security/sandbox/win/src/sharedmem_ipc

security/sandbox/win/src/sharedmem_ipc_server.h@6474c204b198 (annotated)

security/sandbox/win/src/sharedmem_ipc_server.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2012 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.
 #ifndef SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
 #define SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_
 #include <list>
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "sandbox/win/src/crosscall_params.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/sharedmem_ipc_client.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 {
  public:
   // 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);
   ~SharedMemIPCServer();
   // Initializes the server structures, shared memory structures and
   // creates the kernels events used to signal the IPC.
   bool Init(void* shared_mem, uint32 shared_size, uint32 channel_size);
  private:
   // Allow tests to be marked DISABLED_. Note that FLAKY_ and FAILS_ prefixes
   // do not work with sandbox tests.
   FRIEND_TEST_ALL_PREFIXES(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.
     uint32 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_;
   DISALLOW_COPY_AND_ASSIGN(SharedMemIPCServer);
 };
 }  // namespace sandbox
 #endif  // SANDBOX_SRC_SHAREDMEM_IPC_SERVER_H_

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security/sandbox/win/src/sharedmem_ipc_server.h@6474c204b198 (annotated)

security/sandbox/win/src/sharedmem_ipc_server.h