1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/installer/util/registry_util.h"
#include <windows.h>
#include <string>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/win/registry.h"
#include "base/win/windows_types.h"
using base::win::RegKey;
namespace installer {
bool DeleteRegistryKey(HKEY root_key,
const std::wstring& key_path,
REGSAM wow64_access) {
VLOG(1) << "Deleting registry key " << key_path;
RegKey target_key;
LONG result =
target_key.Open(root_key, key_path.c_str(), DELETE | wow64_access);
if (result == ERROR_FILE_NOT_FOUND)
return true;
if (result == ERROR_SUCCESS)
result = target_key.DeleteKey(L"");
if (result != ERROR_SUCCESS) {
LOG(ERROR) << "Failed to delete registry key: " << key_path
<< " error: " << result;
return false;
}
return true;
}
bool DeleteRegistryValue(HKEY reg_root,
const std::wstring& key_path,
REGSAM wow64_access,
const std::wstring& value_name) {
RegKey key;
LONG result =
key.Open(reg_root, key_path.c_str(), KEY_SET_VALUE | wow64_access);
if (result == ERROR_SUCCESS)
result = key.DeleteValue(value_name.c_str());
if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
LOG(ERROR) << "Failed to delete registry value: " << value_name
<< " error: " << result;
return false;
}
return true;
}
ConditionalDeleteResult DeleteRegistryKeyIf(
HKEY root_key,
const std::wstring& key_to_delete_path,
const std::wstring& key_to_test_path,
const REGSAM wow64_access,
const wchar_t* value_name,
const RegistryValuePredicate& predicate) {
DCHECK(root_key);
ConditionalDeleteResult delete_result = ConditionalDeleteResult::NOT_FOUND;
RegKey key;
std::wstring actual_value;
if (key.Open(root_key, key_to_test_path.c_str(),
KEY_QUERY_VALUE | wow64_access) == ERROR_SUCCESS &&
key.ReadValue(value_name, &actual_value) == ERROR_SUCCESS &&
predicate.Evaluate(actual_value)) {
key.Close();
delete_result =
installer::DeleteRegistryKey(root_key, key_to_delete_path, wow64_access)
? ConditionalDeleteResult::DELETED
: ConditionalDeleteResult::DELETE_FAILED;
}
return delete_result;
}
// static
ConditionalDeleteResult DeleteRegistryValueIf(
HKEY root_key,
const wchar_t* key_path,
REGSAM wow64_access,
const wchar_t* value_name,
const RegistryValuePredicate& predicate) {
DCHECK(root_key);
DCHECK(key_path);
ConditionalDeleteResult delete_result = ConditionalDeleteResult::NOT_FOUND;
RegKey key;
std::wstring actual_value;
if (key.Open(root_key, key_path,
KEY_QUERY_VALUE | KEY_SET_VALUE | wow64_access) ==
ERROR_SUCCESS &&
key.ReadValue(value_name, &actual_value) == ERROR_SUCCESS &&
predicate.Evaluate(actual_value)) {
LONG result = key.DeleteValue(value_name);
if (result != ERROR_SUCCESS) {
LOG(ERROR) << "Failed to delete registry value: "
<< (value_name ? value_name : L"(Default)")
<< " error: " << result;
delete_result = ConditionalDeleteResult::DELETE_FAILED;
} else {
delete_result = ConditionalDeleteResult::DELETED;
}
}
return delete_result;
}
bool ValueEquals::Evaluate(const std::wstring& value) const {
return value == value_to_match_;
}
// Open |path| with minimal access to obtain information about it, returning
// true and populating |file| on success.
// static
bool ProgramCompare::OpenForInfo(const base::FilePath& path, base::File* file) {
DCHECK(file);
file->Initialize(path,
base::File::FLAG_OPEN | base::File::FLAG_WIN_SHARE_DELETE);
return file->IsValid();
}
// Populate |info| for |file|, returning true on success.
// static
bool ProgramCompare::GetInfo(const base::File& file,
BY_HANDLE_FILE_INFORMATION* info) {
DCHECK(file.IsValid());
return GetFileInformationByHandle(file.GetPlatformFile(), info) != 0;
}
ProgramCompare::ProgramCompare(const base::FilePath& path_to_match)
: path_to_match_(path_to_match), file_info_() {
DCHECK(!path_to_match_.empty());
if (!OpenForInfo(path_to_match_, &file_)) {
PLOG(WARNING) << "Failed opening " << path_to_match_.value()
<< "; falling back to path string comparisons.";
} else if (!GetInfo(file_, &file_info_)) {
PLOG(WARNING) << "Failed getting information for " << path_to_match_.value()
<< "; falling back to path string comparisons.";
file_.Close();
}
}
ProgramCompare::~ProgramCompare() = default;
bool ProgramCompare::Evaluate(const std::wstring& value) const {
// Suss out the exe portion of the value, which is expected to be a command
// line kinda (or exactly) like:
// "c:\foo\bar\chrome.exe" -- "%1"
base::FilePath program(base::CommandLine::FromString(value).GetProgram());
if (program.empty()) {
LOG(WARNING) << "Failed to parse an executable name from command line: \""
<< value << "\"";
return false;
}
return EvaluatePath(program);
}
bool ProgramCompare::EvaluatePath(const base::FilePath& path) const {
// Try the simple thing first: do the paths happen to match?
if (base::FilePath::CompareEqualIgnoreCase(path_to_match_.value(),
path.value()))
return true;
// If the paths don't match and we couldn't open the expected file, we've done
// our best.
if (!file_.IsValid())
return false;
// Open the program and see if it references the expected file.
base::File file;
BY_HANDLE_FILE_INFORMATION info = {};
return (OpenForInfo(path, &file) && GetInfo(file, &info) &&
info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
info.nFileIndexHigh == file_info_.nFileIndexHigh &&
info.nFileIndexLow == file_info_.nFileIndexLow);
}
} // namespace installer
|
