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1 // Copyright 2015 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 // State is stored in the Windows registry in a value of the key | |
6 // HKEY_CURRENT_USER\Software\<browser>\IncidentsSent for each profile. The | |
7 // value names are profile directory BaseNames. | |
8 | |
9 #include "chrome/browser/safe_browsing/incident_reporting/platform_state_store.h " | |
10 | |
11 #include <windows.h> | |
12 | |
13 #include "base/numerics/safe_conversions.h" | |
14 #include "base/win/registry.h" | |
15 #include "chrome/browser/profiles/profile.h" | |
16 #include "chrome/installer/util/browser_distribution.h" | |
17 | |
18 namespace safe_browsing { | |
19 namespace platform_state_store { | |
20 | |
21 namespace { | |
22 | |
23 // Returns the path to the registry key holding profile-specific state values. | |
24 base::string16 GetStateStoreKeyName() { | |
25 base::string16 key_name(L"Software\\"); | |
26 return key_name.append( | |
27 BrowserDistribution::GetDistribution()->GetInstallSubDir()) | |
robertshield
2015/09/01 14:20:12
FYI, I've seen two ways of building such reg key p
grt (UTC plus 2)
2015/09/03 18:12:05
Thanks for pointing that out. The other way doesn'
robertshield
2015/09/05 03:23:24
I reckon not, though for cases that don't store pr
| |
28 .append(L"\\IncidentsSent"); | |
29 } | |
30 | |
31 // Returns the name of the registry value for |profile|'s state. | |
32 base::string16 GetValueNameForProfile(Profile* profile) { | |
33 return profile->GetPath().BaseName().value(); | |
34 } | |
35 | |
36 // Clears |profile|'s state. | |
37 PlatformStateStoreLoadResult ClearStoreData(Profile* profile) { | |
38 base::win::RegKey key; | |
39 | |
40 if (key.Open(HKEY_CURRENT_USER, GetStateStoreKeyName().c_str(), | |
41 KEY_QUERY_VALUE | KEY_SET_VALUE | KEY_WOW64_32KEY) == | |
42 ERROR_SUCCESS) { | |
43 base::string16 value_name(GetValueNameForProfile(profile)); | |
44 if (key.HasValue(value_name.c_str())) { | |
45 if (key.DeleteValue(value_name.c_str()) == ERROR_SUCCESS) | |
46 return PlatformStateStoreLoadResult::CLEARED_DATA; | |
47 return PlatformStateStoreLoadResult::DATA_CLEAR_FAILED; | |
48 } | |
49 } | |
50 return PlatformStateStoreLoadResult::CLEARED_NO_DATA; | |
51 } | |
52 | |
53 } // namespace | |
54 | |
55 PlatformStateStoreLoadResult ReadStoreData(Profile* profile, | |
56 std::string* data) { | |
57 // Clear any old state if this is a new profile. | |
58 if (profile->IsNewProfile()) { | |
59 data->clear(); | |
60 return ClearStoreData(profile); | |
61 } | |
62 | |
63 base::string16 value_name(GetValueNameForProfile(profile)); | |
64 base::win::RegKey key; | |
65 if (key.Open(HKEY_CURRENT_USER, GetStateStoreKeyName().c_str(), | |
66 KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) { | |
67 while (true) { | |
68 void* buffer = data->empty() ? nullptr : &(*data)[0]; | |
69 DWORD buffer_size = base::saturated_cast<DWORD, size_t>(data->size()); | |
70 LONG result = | |
71 key.ReadValue(value_name.c_str(), buffer, &buffer_size, nullptr); | |
72 // Trim the output string and return if all data was read. | |
73 if (result == ERROR_SUCCESS && buffer_size <= data->size()) { | |
74 data->resize(buffer_size); | |
75 return PlatformStateStoreLoadResult::SUCCESS; | |
76 } | |
77 // Increase the buffer and retry if more space was needed. Otherwise bail. | |
78 if (buffer_size > data->size()) | |
79 data->resize(buffer_size); | |
80 else | |
81 return PlatformStateStoreLoadResult::READ_FAILED; | |
82 } | |
83 } | |
84 | |
85 return PlatformStateStoreLoadResult::OPEN_FAILED; | |
86 } | |
87 | |
88 void WriteStoreData(Profile* profile, const std::string& data) { | |
89 base::win::RegKey key; | |
90 if (key.Create(HKEY_CURRENT_USER, GetStateStoreKeyName().c_str(), | |
91 KEY_SET_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS) { | |
92 if (data.empty()) { | |
93 key.DeleteValue(GetValueNameForProfile(profile).c_str()); | |
94 } else { | |
95 key.WriteValue(GetValueNameForProfile(profile).c_str(), &data[0], | |
96 base::saturated_cast<DWORD, size_t>(data.size()), | |
97 REG_BINARY); | |
98 } | |
99 } | |
100 } | |
101 | |
102 } // namespace platform_state_store | |
103 } // namespace safe_browsing | |
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