1// Copyright (c) 2006, Google Inc.
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
8//     * Redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer.
10//     * Redistributions in binary form must reproduce the above
11// copyright notice, this list of conditions and the following disclaimer
12// in the documentation and/or other materials provided with the
13// distribution.
14//     * Neither the name of Google Inc. nor the names of its
15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29//
30// file_id.h: Return a unique identifier for a file
31//
32
33#ifndef COMMON_LINUX_FILE_ID_H__
34#define COMMON_LINUX_FILE_ID_H__
35
36#include <limits.h>
37#include <string>
38
39#include "common/linux/guid_creator.h"
40
41namespace google_breakpad {
42
43static const size_t kMDGUIDSize = sizeof(MDGUID);
44
45class FileID {
46 public:
47  explicit FileID(const char* path);
48  ~FileID() {}
49
50  // Load the identifier for the elf file path specified in the constructor into
51  // |identifier|.  Return false if the identifier could not be created for the
52  // file.
53  // The current implementation will look for a .note.gnu.build-id
54  // section and use that as the file id, otherwise it falls back to
55  // XORing the first 4096 bytes of the .text section to generate an identifier.
56  bool ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]);
57
58  // Load the identifier for the elf file mapped into memory at |base| into
59  // |identifier|.  Return false if the identifier could not be created for the
60  // file.
61  static bool ElfFileIdentifierFromMappedFile(const void* base,
62                                              uint8_t identifier[kMDGUIDSize]);
63
64  // Convert the |identifier| data to a NULL terminated string.  The string will
65  // be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).
66  // The |buffer| should be at least 37 bytes long to receive all of the data
67  // and termination.  Shorter buffers will contain truncated data.
68  static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
69                                        char* buffer, int buffer_length);
70
71 private:
72  // Storage for the path specified
73  std::string path_;
74};
75
76}  // namespace google_breakpad
77
78#endif  // COMMON_LINUX_FILE_ID_H__
79