1// Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// Defines InterceptionManager, the class in charge of setting up interceptions
6// for the sandboxed process. For more details see:
7// http://dev.chromium.org/developers/design-documents/sandbox .
8
9#ifndef SANDBOX_SRC_INTERCEPTION_INTERNAL_H_
10#define SANDBOX_SRC_INTERCEPTION_INTERNAL_H_
11
12#include "sandbox/win/src/sandbox_types.h"
13
14namespace sandbox {
15
16const int kMaxThunkDataBytes = 64;
17
18enum InterceptorId;
19
20// The following structures contain variable size fields at the end, and will be
21// used to transfer information between two processes. In order to guarantee
22// our ability to follow the chain of structures, the alignment should be fixed,
23// hence this pragma.
24#pragma pack(push, 4)
25
26// Structures for the shared memory that contains patching information
27// for the InterceptionAgent.
28// A single interception:
29struct FunctionInfo {
30  size_t record_bytes;            // rounded to sizeof(size_t) bytes
31  InterceptionType type;
32  InterceptorId id;
33  const void* interceptor_address;
34  char function[1];               // placeholder for null terminated name
35  // char interceptor[]           // followed by the interceptor function
36};
37
38// A single dll:
39struct DllPatchInfo {
40  size_t record_bytes;            // rounded to sizeof(size_t) bytes
41  size_t offset_to_functions;
42  int num_functions;
43  bool unload_module;
44  wchar_t dll_name[1];            // placeholder for null terminated name
45  // FunctionInfo function_info[] // followed by the functions to intercept
46};
47
48// All interceptions:
49struct SharedMemory {
50  int num_intercepted_dlls;
51  void* interceptor_base;
52  DllPatchInfo dll_list[1];       // placeholder for the list of dlls
53};
54
55// Dummy single thunk:
56struct ThunkData {
57  char data[kMaxThunkDataBytes];
58};
59
60// In-memory representation of the interceptions for a given dll:
61struct DllInterceptionData {
62  size_t data_bytes;
63  size_t used_bytes;
64  void* base;
65  int num_thunks;
66#if defined(_WIN64)
67  int dummy;                      // Improve alignment.
68#endif
69  ThunkData thunks[1];
70};
71
72#pragma pack(pop)
73
74}  // namespace sandbox
75
76#endif  // SANDBOX_SRC_INTERCEPTION_INTERNAL_H_
77