1 // Copyright (c) 2011 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 #include "chrome/browser/crash_upload_list_win.h"
6
7 #include "base/stringprintf.h"
8 #include "base/string_util.h"
9 #include "base/sys_string_conversions.h"
10
CrashUploadListWin(Delegate * delegate)11 CrashUploadListWin::CrashUploadListWin(Delegate* delegate)
12 : CrashUploadList(delegate) {}
13
LoadCrashList()14 void CrashUploadListWin::LoadCrashList() {
15 std::vector<uint8> buffer(1024);
16 HANDLE event_log = OpenEventLog(NULL, L"Application");
17 if (event_log) {
18 while (true) {
19 DWORD bytes_read;
20 DWORD bytes_needed;
21 BOOL success =
22 ReadEventLog(event_log,
23 EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ,
24 0,
25 &buffer[0],
26 buffer.size(),
27 &bytes_read,
28 &bytes_needed);
29 if (success) {
30 DWORD record_offset = 0;
31 // The ReadEventLog() API docs imply, but do not explicitly state that
32 // partial records will not be returned. Use DCHECK() to affirm this.
33 while (record_offset < bytes_read) {
34 DCHECK(record_offset + sizeof(EVENTLOGRECORD) <= bytes_read);
35 EVENTLOGRECORD* record = (EVENTLOGRECORD*)&buffer[record_offset];
36 DCHECK(record_offset + record->Length <= bytes_read);
37 if (IsPossibleCrashLogRecord(record))
38 ProcessPossibleCrashLogRecord(record);
39 record_offset += record->Length;
40 }
41 } else if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
42 // Resize buffer to the required minimum size.
43 buffer.resize(bytes_needed);
44 } else {
45 // Stop on any other error, including the expected case
46 // of ERROR_HANDLE_EOF.
47 DCHECK(GetLastError() == ERROR_HANDLE_EOF);
48 break;
49 }
50 }
51 CloseEventLog(event_log);
52 }
53 }
54
IsPossibleCrashLogRecord(EVENTLOGRECORD * record) const55 bool CrashUploadListWin::IsPossibleCrashLogRecord(
56 EVENTLOGRECORD* record) const {
57 LPWSTR provider_name = (LPWSTR)((uint8*)record + sizeof(EVENTLOGRECORD));
58 return !wcscmp(L"Chrome", provider_name) &&
59 record->EventType == EVENTLOG_INFORMATION_TYPE &&
60 record->NumStrings >= 1;
61 }
62
ProcessPossibleCrashLogRecord(EVENTLOGRECORD * record)63 void CrashUploadListWin::ProcessPossibleCrashLogRecord(EVENTLOGRECORD* record) {
64 // Add the crash if the message matches the expected pattern.
65 const std::wstring pattern_prefix(L"Id=");
66 const std::wstring pattern_suffix(L".");
67 std::wstring message((LPWSTR)((uint8*)record + record->StringOffset));
68 size_t start_index = message.find(pattern_prefix);
69 if (start_index != std::wstring::npos) {
70 start_index += pattern_prefix.size();
71 size_t end_index = message.find(pattern_suffix, start_index);
72 if (end_index != std::wstring::npos) {
73 std::wstring crash_id =
74 message.substr(start_index, end_index - start_index);
75 crashes().push_back(
76 CrashInfo(base::SysWideToUTF8(crash_id),
77 base::Time::FromDoubleT(record->TimeGenerated)));
78 }
79 }
80 }
81